17 Tailwind CSS Side Menus
16 / 17

All 17 in 17 Tailwind CSS Side Menus

  1. 01Tailwind Slide-In Side Menu with Animated Hamburger Icon
  2. 02Tailwind Sidebar Drawer with Blurred Backdrop Overlay
  3. 03Tailwind Off-Canvas Push Sidebar Menu
  4. 04Tailwind Collapsible Icon Sidebar That Expands on Hover
  5. 05Responsive Tailwind Sidebar with Mobile Hamburger Toggle
  6. 06Tailwind Sticky Sidebar Navigation with Scrolling Content
  7. 07Tailwind Multi-Level Dropdown Sidebar Menu (Nested Accordion)
  8. 08Tailwind Full-Height Flexbox Sidebar Layout
  9. 09Tailwind Neumorphism Sidebar Menu (Dark Mode)
  10. 10Tailwind Glassmorphism Sidebar with Backdrop Blur
  11. 11Tailwind Cyberpunk Neon Sidebar (Dark Mode)
  12. 12Brutalist Sidebar Navigation in Tailwind CSS
  13. 13Pure CSS Hamburger Menu in Tailwind (Checkbox Hack, No JS)
  14. 14Tailwind Sidebar Drawer That Opens on Hover
  15. 15Tailwind Collapsible Sidebar with Toggle Button (No JS)
  16. 16Tailwind Accordion Sidebar Navigation for Documentation
  17. 17Tailwind macOS-Style Glass Dock Sidebar with Sliding Highlight
Pure TailwindMIT licensed

Tailwind Accordion Sidebar Navigation for Documentation

A documentation sidebar with a search field, four independently collapsible sections and an active page marker. Each section animates to its true height with the grid-rows-[0fr] → grid-rows-[1fr] technique — no max-height guess — and every section header is reachable by Tab with a visible focus ring. Zero JavaScript.

Live Demo
Plain CSSTailwind v4
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The code

<section class="tsm-16 flex w-full min-h-svh bg-tsm16-bg font-tsm16-sans text-tsm16-ink" aria-label="Accordion sidebar navigation for documentation demo">
  <nav aria-label="Documentation" class="flex w-64 shrink-0 flex-col overflow-y-auto border-r border-tsm16-line bg-tsm16-surface">
    <div class="flex items-center gap-2.5 border-b border-tsm16-line px-4 py-[18px]">
      <span aria-hidden="true" class="grid size-8 place-items-center rounded-lg bg-tsm16-acc text-sm font-extrabold text-white">D</span>
      <p class="text-sm font-extrabold">DocBase <span class="ml-1 text-[10px] font-medium text-tsm16-mut2">v3.2</span></p>
    </div>
    <div class="border-b border-tsm16-line px-3.5 py-2.5">
      <label class="flex min-h-10 items-center gap-2 rounded-lg border border-tsm16-line bg-tsm16-bg px-3 text-tsm16-mut2 focus-within:border-tsm16-acc2 focus-within:ring-3 focus-within:ring-tsm16-acc/15">
        <svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="11" cy="11" r="7"/><path d="m20 20-3.5-3.5"/></svg>
        <span class="sr-only">Search documentation</span>
        <input type="search" placeholder="Search docs…" class="min-w-0 flex-1 bg-transparent text-xs text-tsm16-ink outline-none placeholder:text-tsm16-mut2">
        <kbd class="rounded border border-tsm16-line bg-tsm16-surface px-1.5 font-tsm16-mono text-[10px] text-tsm16-mut2">⌘K</kbd>
      </label>
    </div>
    <a href="#" class="flex min-h-11 items-center gap-2.5 border-b border-tsm16-line px-4 text-[13px] font-semibold text-tsm16-mut2 transition-colors hover:bg-tsm16-acc/4 hover:text-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 10.5 12 3l9 7.5"/><path d="M5 9.5V20h14V9.5"/><path d="M10 20v-6h4v6"/></svg>Overview</a>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a1" class="sr-only" checked>
      <label for="tsm-16-a1" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 15c-1.5 1.3-2 5-2 5s3.7-.5 5-2"/><path d="M9 15l-3-3c1.5-4 5-8.5 12-9-.5 7-5 10.5-9 12z"/><circle cx="14.5" cy="9.5" r="1.5"/></svg>Getting started<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc" aria-current="page">Installation</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Configuration</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Quick start</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Examples</a></li></ul>
      </div>
    </div>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a2" class="sr-only">
      <label for="tsm-16-a2" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m12 3 9 5-9 5-9-5z"/><path d="m3 13 9 5 9-5"/></svg>Core concepts<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Architecture</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Data flow</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">State management</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Routing</a></li></ul>
      </div>
    </div>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a3" class="sr-only">
      <label for="tsm-16-a3" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m8 8-4 4 4 4"/><path d="m16 8 4 4-4 4"/></svg>API reference<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Endpoints<span class="ml-auto rounded-full bg-tsm16-acc/12 px-1.5 text-[10px] font-bold text-tsm16-acc">48</span></a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Authentication</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Webhooks</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Rate limits</a></li></ul>
      </div>
    </div>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a4" class="sr-only">
      <label for="tsm-16-a4" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 19a2 2 0 0 1 2-2h14V3H6a2 2 0 0 0-2 2z"/><path d="M4 19a2 2 0 0 0 2 2h14v-4"/></svg>Guides<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Deployment</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Performance</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Security</a></li></ul>
      </div>
    </div>
    <a href="#" class="flex min-h-11 items-center gap-2.5 border-b border-tsm16-line px-4 text-[13px] font-semibold text-tsm16-mut2 transition-colors hover:bg-tsm16-acc/4 hover:text-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M14 3H6v18h12V7z"/><path d="M14 3v4h4"/><path d="M9 13h6M9 17h6"/></svg>Changelog</a>
  </nav>
  <div class="min-w-0 flex-1 p-6">
    <div class="mx-auto max-w-2xl">
      <h1 class="text-xl font-extrabold">Documentation</h1>
      <p class="mt-1.5 mb-6 max-w-prose text-[13px] leading-relaxed text-tsm16-mut2 text-pretty">Each sidebar section is a hidden checkbox and a <code class="rounded bg-tsm16-acc/8 px-1 font-tsm16-mono text-[12px] text-tsm16-acc">grid-rows-[0fr]</code> → <code class="rounded bg-tsm16-acc/8 px-1 font-tsm16-mono text-[12px] text-tsm16-acc">[1fr]</code> transition, so it opens to its real height.</p>
      <div class="grid gap-2.5">
        <a href="#" class="group/c flex items-center gap-3 rounded-xl border border-tsm16-line bg-tsm16-surface px-4 py-3.5 transition-[border-color,box-shadow,translate] hover:-translate-y-px hover:border-tsm16-acc2 hover:shadow-[0_4px_16px_oklch(0.55_0.2_262/0.1)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-tsm16-acc"><span class="grid size-9 shrink-0 place-items-center rounded-lg bg-tsm16-acc/8 text-tsm16-acc"><svg class="size-[18px] shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 4v11"/><path d="m7 10 5 5 5-5"/><path d="M5 20h14"/></svg></span><span class="min-w-0"><span class="block text-[13px] font-bold">Installation guide</span><span class="block text-xs text-tsm16-mut2">Set up your environment in under five minutes</span></span><svg class="ml-auto size-4 shrink-0 text-tsm16-mut transition-[translate,color] group-hover/c:translate-x-0.5 group-hover/c:text-tsm16-acc" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></a>
        <a href="#" class="group/c flex items-center gap-3 rounded-xl border border-tsm16-line bg-tsm16-surface px-4 py-3.5 transition-[border-color,box-shadow,translate] hover:-translate-y-px hover:border-tsm16-acc2 hover:shadow-[0_4px_16px_oklch(0.55_0.2_262/0.1)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-tsm16-acc"><span class="grid size-9 shrink-0 place-items-center rounded-lg bg-tsm16-acc/8 text-tsm16-acc"><svg class="size-[18px] shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 6h9"/><path d="M19 6h1"/><circle cx="16" cy="6" r="2.5"/><path d="M4 12h2"/><path d="M12 12h8"/><circle cx="9" cy="12" r="2.5"/><path d="M4 18h11"/><circle cx="18" cy="18" r="2.5"/></svg></span><span class="min-w-0"><span class="block text-[13px] font-bold">Configuration reference</span><span class="block text-xs text-tsm16-mut2">Every option, with examples</span></span><svg class="ml-auto size-4 shrink-0 text-tsm16-mut transition-[translate,color] group-hover/c:translate-x-0.5 group-hover/c:text-tsm16-acc" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></a>
        <a href="#" class="group/c flex items-center gap-3 rounded-xl border border-tsm16-line bg-tsm16-surface px-4 py-3.5 transition-[border-color,box-shadow,translate] hover:-translate-y-px hover:border-tsm16-acc2 hover:shadow-[0_4px_16px_oklch(0.55_0.2_262/0.1)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-tsm16-acc"><span class="grid size-9 shrink-0 place-items-center rounded-lg bg-tsm16-acc/8 text-tsm16-acc"><svg class="size-[18px] shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M13 2 4 14h7l-1 8 9-12h-7z"/></svg></span><span class="min-w-0"><span class="block text-[13px] font-bold">Quick-start tutorial</span><span class="block text-xs text-tsm16-mut2">Build your first integration in ten steps</span></span><svg class="ml-auto size-4 shrink-0 text-tsm16-mut transition-[translate,color] group-hover/c:translate-x-0.5 group-hover/c:text-tsm16-acc" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></a>
      </div>
    </div>
  </div>
</section>
@import "tailwindcss";

@theme {
  --color-tsm16-bg: #f0f4ff;
  --color-tsm16-bg: oklch(0.967 0.015 270);
  --color-tsm16-surface: #ffffff;
  --color-tsm16-surface: oklch(1 0 0);
  --color-tsm16-line: #e2e8f0;
  --color-tsm16-line: oklch(0.929 0.013 255.5);
  --color-tsm16-acc: #2563eb;
  --color-tsm16-acc: oklch(0.546 0.215 262.9);
  --color-tsm16-acc2: #60a5fa;
  --color-tsm16-acc2: oklch(0.714 0.143 254.6);
  --color-tsm16-ink: #0f172a;
  --color-tsm16-ink: oklch(0.208 0.04 265.8);
  --color-tsm16-mut: #94a3b8;
  --color-tsm16-mut: oklch(0.711 0.035 256.8);
  --color-tsm16-mut2: #526075;
  --color-tsm16-mut2: oklch(0.485 0.038 258.4);
  --font-tsm16-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-tsm16-mono: 'JetBrains Mono', ui-monospace, monospace;
}
/* Root rule: the full-bleed contract, stated in CSS as well as in the markup's utilities, so the
   stage is sized before the browser build compiles. */

.tsm-16 {
  width: 100%;
  min-height: 100svh;
}

Setup — do this once per project

Skip this if your project already runs Tailwind v4.

1Load Tailwind
<script src="https://cdn.jsdelivr.net/npm/@tailwindcss/browser@4"></script>

Compiles in the browser — perfect for a CodePen or a quick test, not for production.

2Add the stylesheetRequiredthe @theme block is what makes the custom utilities exist
@import "tailwindcss";

@theme {
  --color-tsm16-bg: #f0f4ff;
  --color-tsm16-bg: oklch(0.967 0.015 270);
  --color-tsm16-surface: #ffffff;
  --color-tsm16-surface: oklch(1 0 0);
  --color-tsm16-line: #e2e8f0;
  --color-tsm16-line: oklch(0.929 0.013 255.5);
  --color-tsm16-acc: #2563eb;
  --color-tsm16-acc: oklch(0.546 0.215 262.9);
  --color-tsm16-acc2: #60a5fa;
  --color-tsm16-acc2: oklch(0.714 0.143 254.6);
  --color-tsm16-ink: #0f172a;
  --color-tsm16-ink: oklch(0.208 0.04 265.8);
  --color-tsm16-mut: #94a3b8;
  --color-tsm16-mut: oklch(0.711 0.035 256.8);
  --color-tsm16-mut2: #526075;
  --color-tsm16-mut2: oklch(0.485 0.038 258.4);
  --font-tsm16-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-tsm16-mono: 'JetBrains Mono', ui-monospace, monospace;
}
/* Root rule: the full-bleed contract, stated in CSS as well as in the markup's utilities, so the
   stage is sized before the browser build compiles. */

.tsm-16 {
  width: 100%;
  min-height: 100svh;
}
3Fonts used by this demooptional — skip if you have your own type stack
<link rel="preconnect" href="https://fonts.googleapis.com">
<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500&display=swap">

What changed in the port

Which parts became utilities, which stayed CSS, and why.

  • max-height: 0 → 400px became grid-rows-[0fr] → grid-rows-[1fr] — the fix the original's own gotcha recommended — so sections ease to their true height with no magic number.
  • The :checked + .header + .items chain became group-has-checked/sec:; the input, label and list no longer have to be adjacent siblings.
  • UI upgrade from the CSS original: headers are keyboard-operable with a focus ring (the checkboxes were display:none), collapsed links are invisible, and the search field gained an icon, a label, a focus ring and a ⌘K hint.
  • UI upgrade: emoji doc icons were replaced with SVG icons in tinted tiles, doc cards became real links with a hover lift, and secondary text rose from #64748b to #526075 (6.4:1).
Paste this into ChatGPT, Claude, Cursor, or any coding assistant. The block below is pre-framed with everything the AI needs to integrate this demo into your project — markup, styles, scoping notes, and the source URL. Hit Copy and paste straight into your chat.
Here's a working CSS demo from CodeFronts. Use it as-is or adapt to your framework. All classes are scoped under a unique prefix so the code won't collide with your existing styles. MIT licensed.
Demo: Tailwind Accordion Sidebar Navigation for Documentation
Source: https://codefronts.com/navigation/tailwind-css-side-menus/tailwind-accordion-sidebar-navigation-documentation/

A documentation sidebar with a search field, four independently collapsible sections and an active page marker. Each section animates to its true height with the grid-rows-[0fr] → grid-rows-[1fr] technique — no max-height guess — and every section header is reachable by Tab with a visible focus ring. Zero JavaScript.
## HTML
```html
<section class="tsm-16 flex w-full min-h-svh bg-tsm16-bg font-tsm16-sans text-tsm16-ink" aria-label="Accordion sidebar navigation for documentation demo">
  <nav aria-label="Documentation" class="flex w-64 shrink-0 flex-col overflow-y-auto border-r border-tsm16-line bg-tsm16-surface">
    <div class="flex items-center gap-2.5 border-b border-tsm16-line px-4 py-[18px]">
      <span aria-hidden="true" class="grid size-8 place-items-center rounded-lg bg-tsm16-acc text-sm font-extrabold text-white">D</span>
      <p class="text-sm font-extrabold">DocBase <span class="ml-1 text-[10px] font-medium text-tsm16-mut2">v3.2</span></p>
    </div>
    <div class="border-b border-tsm16-line px-3.5 py-2.5">
      <label class="flex min-h-10 items-center gap-2 rounded-lg border border-tsm16-line bg-tsm16-bg px-3 text-tsm16-mut2 focus-within:border-tsm16-acc2 focus-within:ring-3 focus-within:ring-tsm16-acc/15">
        <svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><circle cx="11" cy="11" r="7"/><path d="m20 20-3.5-3.5"/></svg>
        <span class="sr-only">Search documentation</span>
        <input type="search" placeholder="Search docs…" class="min-w-0 flex-1 bg-transparent text-xs text-tsm16-ink outline-none placeholder:text-tsm16-mut2">
        <kbd class="rounded border border-tsm16-line bg-tsm16-surface px-1.5 font-tsm16-mono text-[10px] text-tsm16-mut2">⌘K</kbd>
      </label>
    </div>
    <a href="#" class="flex min-h-11 items-center gap-2.5 border-b border-tsm16-line px-4 text-[13px] font-semibold text-tsm16-mut2 transition-colors hover:bg-tsm16-acc/4 hover:text-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M3 10.5 12 3l9 7.5"/><path d="M5 9.5V20h14V9.5"/><path d="M10 20v-6h4v6"/></svg>Overview</a>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a1" class="sr-only" checked>
      <label for="tsm-16-a1" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M5 15c-1.5 1.3-2 5-2 5s3.7-.5 5-2"/><path d="M9 15l-3-3c1.5-4 5-8.5 12-9-.5 7-5 10.5-9 12z"/><circle cx="14.5" cy="9.5" r="1.5"/></svg>Getting started<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc" aria-current="page">Installation</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Configuration</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Quick start</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Examples</a></li></ul>
      </div>
    </div>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a2" class="sr-only">
      <label for="tsm-16-a2" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m12 3 9 5-9 5-9-5z"/><path d="m3 13 9 5 9-5"/></svg>Core concepts<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Architecture</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Data flow</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">State management</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Routing</a></li></ul>
      </div>
    </div>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a3" class="sr-only">
      <label for="tsm-16-a3" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m8 8-4 4 4 4"/><path d="m16 8 4 4-4 4"/></svg>API reference<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Endpoints<span class="ml-auto rounded-full bg-tsm16-acc/12 px-1.5 text-[10px] font-bold text-tsm16-acc">48</span></a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Authentication</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Webhooks</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Rate limits</a></li></ul>
      </div>
    </div>
    <div class="group/sec border-b border-tsm16-line">
      <input type="checkbox" id="tsm-16-a4" class="sr-only">
      <label for="tsm-16-a4" class="flex min-h-11 cursor-pointer items-center gap-2.5 px-4 text-xs font-bold tracking-[0.1em] text-tsm16-mut2 uppercase select-none transition-colors hover:bg-tsm16-acc/4 group-has-checked/sec:text-tsm16-acc group-has-[input:focus-visible]/sec:outline-2 group-has-[input:focus-visible]/sec:-outline-offset-2 group-has-[input:focus-visible]/sec:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 19a2 2 0 0 1 2-2h14V3H6a2 2 0 0 0-2 2z"/><path d="M4 19a2 2 0 0 0 2 2h14v-4"/></svg>Guides<svg class="ml-auto size-3.5 shrink-0 transition-transform duration-300 group-has-checked/sec:rotate-90 motion-reduce:transition-none" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></label>
      <div class="grid grid-rows-[0fr] transition-[grid-template-rows] duration-350 ease-[cubic-bezier(0.4,0,0.2,1)] group-has-checked/sec:grid-rows-[1fr] motion-reduce:transition-none">
        <ul class="invisible min-h-0 overflow-hidden pb-0 transition-[visibility] duration-350 group-has-checked/sec:visible group-has-checked/sec:pb-2"><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Deployment</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Performance</a></li><li><a href="#" class="relative flex min-h-10 items-center gap-2.5 py-2 pr-4 pl-9 text-[13px] font-semibold text-tsm16-mut2 transition-colors before:absolute before:top-1/2 before:left-5 before:size-1 before:-translate-y-1/2 before:rounded-full before:bg-tsm16-mut before:transition-[background-color,scale] hover:bg-tsm16-acc/5 hover:text-tsm16-acc hover:before:scale-150 hover:before:bg-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc aria-[current=page]:bg-tsm16-acc/7 aria-[current=page]:text-tsm16-acc aria-[current=page]:before:bg-tsm16-acc">Security</a></li></ul>
      </div>
    </div>
    <a href="#" class="flex min-h-11 items-center gap-2.5 border-b border-tsm16-line px-4 text-[13px] font-semibold text-tsm16-mut2 transition-colors hover:bg-tsm16-acc/4 hover:text-tsm16-acc focus-visible:outline-2 focus-visible:-outline-offset-2 focus-visible:outline-tsm16-acc"><svg class="size-4 shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M14 3H6v18h12V7z"/><path d="M14 3v4h4"/><path d="M9 13h6M9 17h6"/></svg>Changelog</a>
  </nav>
  <div class="min-w-0 flex-1 p-6">
    <div class="mx-auto max-w-2xl">
      <h1 class="text-xl font-extrabold">Documentation</h1>
      <p class="mt-1.5 mb-6 max-w-prose text-[13px] leading-relaxed text-tsm16-mut2 text-pretty">Each sidebar section is a hidden checkbox and a <code class="rounded bg-tsm16-acc/8 px-1 font-tsm16-mono text-[12px] text-tsm16-acc">grid-rows-[0fr]</code> → <code class="rounded bg-tsm16-acc/8 px-1 font-tsm16-mono text-[12px] text-tsm16-acc">[1fr]</code> transition, so it opens to its real height.</p>
      <div class="grid gap-2.5">
        <a href="#" class="group/c flex items-center gap-3 rounded-xl border border-tsm16-line bg-tsm16-surface px-4 py-3.5 transition-[border-color,box-shadow,translate] hover:-translate-y-px hover:border-tsm16-acc2 hover:shadow-[0_4px_16px_oklch(0.55_0.2_262/0.1)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-tsm16-acc"><span class="grid size-9 shrink-0 place-items-center rounded-lg bg-tsm16-acc/8 text-tsm16-acc"><svg class="size-[18px] shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M12 4v11"/><path d="m7 10 5 5 5-5"/><path d="M5 20h14"/></svg></span><span class="min-w-0"><span class="block text-[13px] font-bold">Installation guide</span><span class="block text-xs text-tsm16-mut2">Set up your environment in under five minutes</span></span><svg class="ml-auto size-4 shrink-0 text-tsm16-mut transition-[translate,color] group-hover/c:translate-x-0.5 group-hover/c:text-tsm16-acc" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></a>
        <a href="#" class="group/c flex items-center gap-3 rounded-xl border border-tsm16-line bg-tsm16-surface px-4 py-3.5 transition-[border-color,box-shadow,translate] hover:-translate-y-px hover:border-tsm16-acc2 hover:shadow-[0_4px_16px_oklch(0.55_0.2_262/0.1)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-tsm16-acc"><span class="grid size-9 shrink-0 place-items-center rounded-lg bg-tsm16-acc/8 text-tsm16-acc"><svg class="size-[18px] shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M4 6h9"/><path d="M19 6h1"/><circle cx="16" cy="6" r="2.5"/><path d="M4 12h2"/><path d="M12 12h8"/><circle cx="9" cy="12" r="2.5"/><path d="M4 18h11"/><circle cx="18" cy="18" r="2.5"/></svg></span><span class="min-w-0"><span class="block text-[13px] font-bold">Configuration reference</span><span class="block text-xs text-tsm16-mut2">Every option, with examples</span></span><svg class="ml-auto size-4 shrink-0 text-tsm16-mut transition-[translate,color] group-hover/c:translate-x-0.5 group-hover/c:text-tsm16-acc" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></a>
        <a href="#" class="group/c flex items-center gap-3 rounded-xl border border-tsm16-line bg-tsm16-surface px-4 py-3.5 transition-[border-color,box-shadow,translate] hover:-translate-y-px hover:border-tsm16-acc2 hover:shadow-[0_4px_16px_oklch(0.55_0.2_262/0.1)] focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-tsm16-acc"><span class="grid size-9 shrink-0 place-items-center rounded-lg bg-tsm16-acc/8 text-tsm16-acc"><svg class="size-[18px] shrink-0" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="M13 2 4 14h7l-1 8 9-12h-7z"/></svg></span><span class="min-w-0"><span class="block text-[13px] font-bold">Quick-start tutorial</span><span class="block text-xs text-tsm16-mut2">Build your first integration in ten steps</span></span><svg class="ml-auto size-4 shrink-0 text-tsm16-mut transition-[translate,color] group-hover/c:translate-x-0.5 group-hover/c:text-tsm16-acc" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="1.8" stroke-linecap="round" stroke-linejoin="round" aria-hidden="true"><path d="m9 6 6 6-6 6"/></svg></a>
      </div>
    </div>
  </div>
</section>
```
## CSS
```css
@import "tailwindcss";

@theme {
  --color-tsm16-bg: #f0f4ff;
  --color-tsm16-bg: oklch(0.967 0.015 270);
  --color-tsm16-surface: #ffffff;
  --color-tsm16-surface: oklch(1 0 0);
  --color-tsm16-line: #e2e8f0;
  --color-tsm16-line: oklch(0.929 0.013 255.5);
  --color-tsm16-acc: #2563eb;
  --color-tsm16-acc: oklch(0.546 0.215 262.9);
  --color-tsm16-acc2: #60a5fa;
  --color-tsm16-acc2: oklch(0.714 0.143 254.6);
  --color-tsm16-ink: #0f172a;
  --color-tsm16-ink: oklch(0.208 0.04 265.8);
  --color-tsm16-mut: #94a3b8;
  --color-tsm16-mut: oklch(0.711 0.035 256.8);
  --color-tsm16-mut2: #526075;
  --color-tsm16-mut2: oklch(0.485 0.038 258.4);
  --font-tsm16-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-tsm16-mono: 'JetBrains Mono', ui-monospace, monospace;
}
/* Root rule: the full-bleed contract, stated in CSS as well as in the markup's utilities, so the
   stage is sized before the browser build compiles. */

.tsm-16 {
  width: 100%;
  min-height: 100svh;
}
```

How this works

The 0fr → 1fr trick. A single-row grid whose track transitions from 0fr to 1fr grows to exactly its content's height. The child needs min-h-0 and overflow-hidden so it can shrink below its intrinsic size:

<div class="group/sec">
  <input type="checkbox" class="sr-only">
  <label>Getting started</label>
  <div class="grid grid-rows-[0fr] transition-[grid-template-rows]
    group-has-checked/sec:grid-rows-[1fr]">
    <ul class="min-h-0 overflow-hidden">

One group name, many sections. Every section is group/sec; a group-*/sec: variant resolves against the nearest matching ancestor, so sections never react to each other.

Keyboard-ready. The checkbox is sr-only; Tab focuses it, Space toggles it, and group-has-[input:focus-visible]/sec: draws the ring on the visible header.

Make it yours

  • Exclusive sections: switch to type="radio" inputs sharing one name.
  • Pre-open a section with the checked attribute.
  • Live filtering needs a few lines of JS on the search field — the accordion CSS stays as is.
  • Indent deeper levels by increasing pl-9 and the before:left-5 dot offset together.

Gotchas — read before shipping

  • Forget min-h-0 on the grid child and the row never collapses below the content height.
  • Checkboxes inside a <form> are submitted — leave them unnamed.
  • grid-template-rows transitions need Chrome 107 / Safari 16 / Firefox 66; older engines toggle instantly.

Browser support

ChromeSafariFirefoxEdge
111+16.4+128+111+

Animatable grid-template-rows and :has() are inside v4's own browser floor.

Techniques used in this demo

Utilitiesfirst-class utility or variant

:has()tw ↗

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