20 Tailwind CSS Claymorphism
04 / 20

All 20 in 20 Tailwind CSS Claymorphism

  1. 01Tailwind CSS Claymorphism Box Shadow Recipe (3-Layer Formula)
  2. 02Tailwind Inner Shadow & Inset Highlight for Clay UI
  3. 03Tailwind Border Radius Scale & Squircle Corners for Puffy Shapes
  4. 04Claymorphism vs Neumorphism in Tailwind CSS (Side-by-Side)
  5. 05Tailwind Glassmorphism + Claymorphism Hybrid Card
  6. 06Tailwind Clay UI Light Source & Shadow Direction System
  7. 07Tailwind Elevation Shadow Scale: Clay Depth Tiers
  8. 08Tailwind CSS v4 Claymorphism: @theme Tokens, @utility & Arbitrary Values
  9. 09Tailwind 3D Clay Button with Press & Squish Animation
  10. 10Tailwind Toggle Switch, Checkbox & Segmented Control (Clay Style)
  11. 11Tailwind Search Bar & Floating Label Input (Clay Inset Style)
  12. 12Tailwind Badge & Pill Tag Components (Clay Style)
  13. 13Tailwind Claymorphism Card Component (Container Query Responsive)
  14. 14Tailwind Modal Dialog with Popover API (Clay Floating Depth)
  15. 15Tailwind Pricing Table with Monthly/Yearly Toggle (Clay Style)
  16. 16Tailwind Mobile Bottom Navigation Bar (Clay Tab Bar)
  17. 17Tailwind App Icon Grid with 3D Hover Tilt (Clay Tiles)
  18. 18Tailwind Toast Notification & Alert Components (Clay Style)
  19. 19Tailwind Dark Mode Claymorphism: Shadow Recalibration with light-dark()
  20. 20Tailwind Animation Performance: GPU Transform vs Box-Shadow (Live FPS Meter)
Pure TailwindMIT licensed

Claymorphism vs Neumorphism in Tailwind CSS (Side-by-Side)

The comparison people actually search for: two identical cards that differ only in shadow strategy — extruded-from-the-page neumorphism and lifted-object claymorphism — with a switch that re-skins the neumorphic card in clay tokens. The port fixes the original's half-swap (the button kept its 14px corner) and adds a live contrast verdict to each card.

Live Demo
Plain CSSTailwind v4
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The code

<section class="tcl-04 group/demo w-full min-h-svh grid place-items-center bg-tcl04-bg px-5 py-14 font-tcl04-sans text-tcl04-ink" aria-label="Claymorphism versus neumorphism comparison demo">
  <div class="grid w-full justify-items-center gap-[clamp(24px,4vw,40px)]">
    <header class="grid max-w-[60ch] justify-items-center gap-4 text-center">
      <h2 class="font-tcl04-display text-[clamp(26px,3.8vw,38px)] font-extrabold leading-[1.08] tracking-[-0.03em] text-balance">Clay vs Neu — same card, two depth models</h2>
      <label class="inline-flex min-h-12 cursor-pointer items-center gap-3 rounded-full bg-tcl04-soft py-1.5 pr-5.5 pl-2 text-sm font-semibold shadow-tcl04-pill has-[:focus-visible]:outline-3 has-[:focus-visible]:outline-offset-3 has-[:focus-visible]:outline-tcl04-ink">
        <input class="peer sr-only" type="checkbox" role="switch" id="tcl-04-swap">
        <span aria-hidden="true" class="relative h-9 w-15 rounded-full bg-tcl04-bg shadow-tcl04-track transition-colors duration-300 peer-checked:bg-tcl04-clay/70"></span>
        <span aria-hidden="true" class="absolute ml-1 size-7 rounded-full bg-white shadow-tcl04-knob transition-transform duration-300 ease-[cubic-bezier(.34,1.4,.5,1)] peer-checked:translate-x-6 motion-reduce:transition-none"></span>
        Apply clay tokens to both
      </label>
    </header>
    <div class="grid w-full max-w-[900px] grid-cols-[repeat(auto-fit,minmax(270px,1fr))] gap-[clamp(20px,3vw,34px)]">
      <article class="grid content-start gap-3 rounded-[18px] bg-tcl04-bg p-[clamp(24px,3vw,32px)] shadow-tcl04-neu transition-[translate,background-color,border-radius] duration-500 ease-[cubic-bezier(.34,1.3,.5,1)] hover:-translate-y-1.5 group-has-[#tcl-04-swap:checked]/demo:rounded-[38px] group-has-[#tcl-04-swap:checked]/demo:bg-tcl04-clay group-has-[#tcl-04-swap:checked]/demo:shadow-tcl04-clay motion-reduce:transition-none">
        <p class="text-[11.5px] font-bold uppercase tracking-[0.16em] text-tcl04-mut">Neumorphism</p>
        <h3 class="font-tcl04-display text-[22px] font-bold tracking-[-0.02em]">Soft UI</h3>
        <p class="text-sm leading-relaxed text-tcl04-ink/85 text-pretty">The object is the page, extruded. Fill matches the background; two mirrored outset shadows do all the work.</p>
        <dl class="mt-1 grid gap-2 text-[13px]">
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-mut">Fill</dt><dd class="text-right">= page color</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-mut">Shadows</dt><dd class="text-right">2 outset, mirrored</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-mut">Radius</dt><dd class="text-right">12–20px</dd></div>
        </dl>
        <p class="inline-flex items-center gap-2 justify-self-start rounded-full bg-tcl04-warn/15 px-3 py-1.5 text-[12.5px] font-semibold text-tcl04-warn group-has-[#tcl-04-swap:checked]/demo:bg-tcl04-ok/15 group-has-[#tcl-04-swap:checked]/demo:text-tcl04-ok"><span aria-hidden="true" class="size-2 rounded-full bg-current"></span><span class="group-has-[#tcl-04-swap:checked]/demo:hidden">Edge contrast: shadow only · fails 3:1</span><span class="hidden group-has-[#tcl-04-swap:checked]/demo:inline">Edge contrast: real fill · testable</span></p>
        <button type="button" class="mt-1.5 min-h-12 cursor-pointer justify-self-start rounded-[14px] bg-tcl04-soft px-6 text-sm font-semibold text-tcl04-ink shadow-tcl04-btn transition-[translate,box-shadow,border-radius] duration-200 active:translate-y-0.75 active:shadow-tcl04-press focus-visible:outline-3 focus-visible:outline-offset-3 focus-visible:outline-tcl04-ink group-has-[#tcl-04-swap:checked]/demo:rounded-[22px]">Press me</button>
      </article>
      <article class="grid content-start gap-3 rounded-[38px] bg-tcl04-clay p-[clamp(24px,3vw,32px)] shadow-tcl04-clay transition-[translate] duration-500 ease-[cubic-bezier(.34,1.3,.5,1)] hover:-translate-y-1.5 motion-reduce:transition-none">
        <p class="text-[11.5px] font-bold uppercase tracking-[0.16em] text-tcl04-ink/70">Claymorphism</p>
        <h3 class="font-tcl04-display text-[22px] font-bold tracking-[-0.02em]">Clay UI</h3>
        <p class="text-sm leading-relaxed text-tcl04-ink/85 text-pretty">A separate object on the page. Own fill, outer drop for mass, two insets for thickness and sheen.</p>
        <dl class="mt-1 grid gap-2 text-[13px]">
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-ink/70">Fill</dt><dd class="text-right">lighter than page</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-ink/70">Shadows</dt><dd class="text-right">1 outset + 2 inset</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-ink/70">Radius</dt><dd class="text-right">28–48px</dd></div>
        </dl>
        <p class="inline-flex items-center gap-2 justify-self-start rounded-full bg-white/45 px-3 py-1.5 text-[12.5px] font-semibold text-tcl04-ok"><span aria-hidden="true" class="size-2 rounded-full bg-current"></span>Edge contrast: real fill · testable</p>
        <button type="button" class="mt-1.5 min-h-12 cursor-pointer justify-self-start rounded-[22px] bg-tcl04-soft px-6 text-sm font-semibold text-tcl04-ink shadow-tcl04-btn transition-[translate,box-shadow] duration-200 active:translate-y-0.75 active:shadow-tcl04-press focus-visible:outline-3 focus-visible:outline-offset-3 focus-visible:outline-tcl04-ink">Press me</button>
      </article>
    </div>
    <p aria-hidden="true" class="rounded-full bg-white/55 px-4 py-2 text-center font-tcl04-mono text-[11.5px] text-tcl04-mut">same markup · token-only difference · group-has-[#swap:checked]/demo:</p>
  </div>
</section>
@import "tailwindcss";

@theme {
  --color-tcl04-bg: #e3e8f2;
  --color-tcl04-bg: oklch(0.93 0.015 265);
  --color-tcl04-light: #ffffffeb;
  --color-tcl04-light: oklch(1 0 0 / 0.92);
  --color-tcl04-shade: #7486ab8c;
  --color-tcl04-shade: oklch(0.62 0.06 265 / 0.55);
  --color-tcl04-ink: #242b3b;
  --color-tcl04-ink: oklch(0.29 0.03 265);
  --color-tcl04-mut: #4e586c;
  --color-tcl04-mut: oklch(0.46 0.035 265);
  --color-tcl04-clay: #b7c6ff;
  --color-tcl04-clay: oklch(0.84 0.1 275);
  --color-tcl04-soft: color-mix(in oklch, var(--color-tcl04-bg) 80%, white);
  --color-tcl04-warn: #a7391e;
  --color-tcl04-warn: oklch(0.5 0.15 35);
  --color-tcl04-ok: #006836;
  --color-tcl04-ok: oklch(0.45 0.12 155);
  --font-tcl04-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-tcl04-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-tcl04-mono: 'JetBrains Mono', ui-monospace, monospace;
  --shadow-tcl04-neu: -9px -9px 18px var(--color-tcl04-light), 9px 9px 20px var(--color-tcl04-shade);
  --shadow-tcl04-clay: 0 26px 46px -16px var(--color-tcl04-shade), inset 0 -16px 26px -12px var(--color-tcl04-shade), inset 0 18px 26px -8px var(--color-tcl04-light);
  --shadow-tcl04-btn: 0 10px 18px -12px var(--color-tcl04-shade), inset 0 -8px 12px -9px var(--color-tcl04-shade), inset 0 9px 12px -7px var(--color-tcl04-light);
  --shadow-tcl04-press: 0 4px 8px -8px var(--color-tcl04-shade), inset 0 8px 14px -8px var(--color-tcl04-shade), inset 0 -6px 12px -9px var(--color-tcl04-light);
  --shadow-tcl04-pill: 0 12px 22px -14px var(--color-tcl04-shade), inset 0 -8px 14px -10px var(--color-tcl04-shade), inset 0 10px 14px -8px var(--color-tcl04-light);
  --shadow-tcl04-track: inset 0 4px 8px -3px var(--color-tcl04-shade), inset 0 -3px 6px -3px var(--color-tcl04-light);
  --shadow-tcl04-knob: 0 4px 8px -3px var(--color-tcl04-shade), inset 0 -3px 5px -3px var(--color-tcl04-shade);
}
/* 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. */

.tcl-04 {
  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-tcl04-bg: #e3e8f2;
  --color-tcl04-bg: oklch(0.93 0.015 265);
  --color-tcl04-light: #ffffffeb;
  --color-tcl04-light: oklch(1 0 0 / 0.92);
  --color-tcl04-shade: #7486ab8c;
  --color-tcl04-shade: oklch(0.62 0.06 265 / 0.55);
  --color-tcl04-ink: #242b3b;
  --color-tcl04-ink: oklch(0.29 0.03 265);
  --color-tcl04-mut: #4e586c;
  --color-tcl04-mut: oklch(0.46 0.035 265);
  --color-tcl04-clay: #b7c6ff;
  --color-tcl04-clay: oklch(0.84 0.1 275);
  --color-tcl04-soft: color-mix(in oklch, var(--color-tcl04-bg) 80%, white);
  --color-tcl04-warn: #a7391e;
  --color-tcl04-warn: oklch(0.5 0.15 35);
  --color-tcl04-ok: #006836;
  --color-tcl04-ok: oklch(0.45 0.12 155);
  --font-tcl04-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-tcl04-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-tcl04-mono: 'JetBrains Mono', ui-monospace, monospace;
  --shadow-tcl04-neu: -9px -9px 18px var(--color-tcl04-light), 9px 9px 20px var(--color-tcl04-shade);
  --shadow-tcl04-clay: 0 26px 46px -16px var(--color-tcl04-shade), inset 0 -16px 26px -12px var(--color-tcl04-shade), inset 0 18px 26px -8px var(--color-tcl04-light);
  --shadow-tcl04-btn: 0 10px 18px -12px var(--color-tcl04-shade), inset 0 -8px 12px -9px var(--color-tcl04-shade), inset 0 9px 12px -7px var(--color-tcl04-light);
  --shadow-tcl04-press: 0 4px 8px -8px var(--color-tcl04-shade), inset 0 8px 14px -8px var(--color-tcl04-shade), inset 0 -6px 12px -9px var(--color-tcl04-light);
  --shadow-tcl04-pill: 0 12px 22px -14px var(--color-tcl04-shade), inset 0 -8px 14px -10px var(--color-tcl04-shade), inset 0 10px 14px -8px var(--color-tcl04-light);
  --shadow-tcl04-track: inset 0 4px 8px -3px var(--color-tcl04-shade), inset 0 -3px 6px -3px var(--color-tcl04-light);
  --shadow-tcl04-knob: 0 4px 8px -3px var(--color-tcl04-shade), inset 0 -3px 5px -3px var(--color-tcl04-shade);
}
/* 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. */

.tcl-04 {
  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=Bricolage+Grotesque:opsz,wght@12..96,500..800&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap">

What changed in the port

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

  • .cl-04:has(#swap:checked) .card--neu{…} became group-has-[#tcl-04-swap:checked]/demo: on each element it changes, which is exactly what exposed the original's missed button radius.
  • UI upgrade from the CSS original: the round "knob" that only changed colour is now a real sliding switch with role="switch", and the swap now re-skins the button radius too.
  • UI upgrade: each card carries an edge-contrast verdict chip (fail / testable) that flips with the swap — the accessibility argument is on the card, not buried in a spec row.
  • UI upgrade: muted copy raised from 0.53 to 0.46 lightness (5.3:1).
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: Claymorphism vs Neumorphism in Tailwind CSS (Side-by-Side)
Source: https://codefronts.com/design-styles/tailwind-css-claymorphism/claymorphism-vs-neumorphism-tailwind-css/

The comparison people actually search for: two identical cards that differ only in shadow strategy — extruded-from-the-page neumorphism and lifted-object claymorphism — with a switch that re-skins the neumorphic card in clay tokens. The port fixes the original's half-swap (the button kept its 14px corner) and adds a live contrast verdict to each card.
## HTML
```html
<section class="tcl-04 group/demo w-full min-h-svh grid place-items-center bg-tcl04-bg px-5 py-14 font-tcl04-sans text-tcl04-ink" aria-label="Claymorphism versus neumorphism comparison demo">
  <div class="grid w-full justify-items-center gap-[clamp(24px,4vw,40px)]">
    <header class="grid max-w-[60ch] justify-items-center gap-4 text-center">
      <h2 class="font-tcl04-display text-[clamp(26px,3.8vw,38px)] font-extrabold leading-[1.08] tracking-[-0.03em] text-balance">Clay vs Neu — same card, two depth models</h2>
      <label class="inline-flex min-h-12 cursor-pointer items-center gap-3 rounded-full bg-tcl04-soft py-1.5 pr-5.5 pl-2 text-sm font-semibold shadow-tcl04-pill has-[:focus-visible]:outline-3 has-[:focus-visible]:outline-offset-3 has-[:focus-visible]:outline-tcl04-ink">
        <input class="peer sr-only" type="checkbox" role="switch" id="tcl-04-swap">
        <span aria-hidden="true" class="relative h-9 w-15 rounded-full bg-tcl04-bg shadow-tcl04-track transition-colors duration-300 peer-checked:bg-tcl04-clay/70"></span>
        <span aria-hidden="true" class="absolute ml-1 size-7 rounded-full bg-white shadow-tcl04-knob transition-transform duration-300 ease-[cubic-bezier(.34,1.4,.5,1)] peer-checked:translate-x-6 motion-reduce:transition-none"></span>
        Apply clay tokens to both
      </label>
    </header>
    <div class="grid w-full max-w-[900px] grid-cols-[repeat(auto-fit,minmax(270px,1fr))] gap-[clamp(20px,3vw,34px)]">
      <article class="grid content-start gap-3 rounded-[18px] bg-tcl04-bg p-[clamp(24px,3vw,32px)] shadow-tcl04-neu transition-[translate,background-color,border-radius] duration-500 ease-[cubic-bezier(.34,1.3,.5,1)] hover:-translate-y-1.5 group-has-[#tcl-04-swap:checked]/demo:rounded-[38px] group-has-[#tcl-04-swap:checked]/demo:bg-tcl04-clay group-has-[#tcl-04-swap:checked]/demo:shadow-tcl04-clay motion-reduce:transition-none">
        <p class="text-[11.5px] font-bold uppercase tracking-[0.16em] text-tcl04-mut">Neumorphism</p>
        <h3 class="font-tcl04-display text-[22px] font-bold tracking-[-0.02em]">Soft UI</h3>
        <p class="text-sm leading-relaxed text-tcl04-ink/85 text-pretty">The object is the page, extruded. Fill matches the background; two mirrored outset shadows do all the work.</p>
        <dl class="mt-1 grid gap-2 text-[13px]">
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-mut">Fill</dt><dd class="text-right">= page color</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-mut">Shadows</dt><dd class="text-right">2 outset, mirrored</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-mut">Radius</dt><dd class="text-right">12–20px</dd></div>
        </dl>
        <p class="inline-flex items-center gap-2 justify-self-start rounded-full bg-tcl04-warn/15 px-3 py-1.5 text-[12.5px] font-semibold text-tcl04-warn group-has-[#tcl-04-swap:checked]/demo:bg-tcl04-ok/15 group-has-[#tcl-04-swap:checked]/demo:text-tcl04-ok"><span aria-hidden="true" class="size-2 rounded-full bg-current"></span><span class="group-has-[#tcl-04-swap:checked]/demo:hidden">Edge contrast: shadow only · fails 3:1</span><span class="hidden group-has-[#tcl-04-swap:checked]/demo:inline">Edge contrast: real fill · testable</span></p>
        <button type="button" class="mt-1.5 min-h-12 cursor-pointer justify-self-start rounded-[14px] bg-tcl04-soft px-6 text-sm font-semibold text-tcl04-ink shadow-tcl04-btn transition-[translate,box-shadow,border-radius] duration-200 active:translate-y-0.75 active:shadow-tcl04-press focus-visible:outline-3 focus-visible:outline-offset-3 focus-visible:outline-tcl04-ink group-has-[#tcl-04-swap:checked]/demo:rounded-[22px]">Press me</button>
      </article>
      <article class="grid content-start gap-3 rounded-[38px] bg-tcl04-clay p-[clamp(24px,3vw,32px)] shadow-tcl04-clay transition-[translate] duration-500 ease-[cubic-bezier(.34,1.3,.5,1)] hover:-translate-y-1.5 motion-reduce:transition-none">
        <p class="text-[11.5px] font-bold uppercase tracking-[0.16em] text-tcl04-ink/70">Claymorphism</p>
        <h3 class="font-tcl04-display text-[22px] font-bold tracking-[-0.02em]">Clay UI</h3>
        <p class="text-sm leading-relaxed text-tcl04-ink/85 text-pretty">A separate object on the page. Own fill, outer drop for mass, two insets for thickness and sheen.</p>
        <dl class="mt-1 grid gap-2 text-[13px]">
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-ink/70">Fill</dt><dd class="text-right">lighter than page</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-ink/70">Shadows</dt><dd class="text-right">1 outset + 2 inset</dd></div>
          <div class="flex justify-between gap-3 border-b border-tcl04-ink/12 pb-2"><dt class="font-semibold text-tcl04-ink/70">Radius</dt><dd class="text-right">28–48px</dd></div>
        </dl>
        <p class="inline-flex items-center gap-2 justify-self-start rounded-full bg-white/45 px-3 py-1.5 text-[12.5px] font-semibold text-tcl04-ok"><span aria-hidden="true" class="size-2 rounded-full bg-current"></span>Edge contrast: real fill · testable</p>
        <button type="button" class="mt-1.5 min-h-12 cursor-pointer justify-self-start rounded-[22px] bg-tcl04-soft px-6 text-sm font-semibold text-tcl04-ink shadow-tcl04-btn transition-[translate,box-shadow] duration-200 active:translate-y-0.75 active:shadow-tcl04-press focus-visible:outline-3 focus-visible:outline-offset-3 focus-visible:outline-tcl04-ink">Press me</button>
      </article>
    </div>
    <p aria-hidden="true" class="rounded-full bg-white/55 px-4 py-2 text-center font-tcl04-mono text-[11.5px] text-tcl04-mut">same markup · token-only difference · group-has-[#swap:checked]/demo:</p>
  </div>
</section>
```
## CSS
```css
@import "tailwindcss";

@theme {
  --color-tcl04-bg: #e3e8f2;
  --color-tcl04-bg: oklch(0.93 0.015 265);
  --color-tcl04-light: #ffffffeb;
  --color-tcl04-light: oklch(1 0 0 / 0.92);
  --color-tcl04-shade: #7486ab8c;
  --color-tcl04-shade: oklch(0.62 0.06 265 / 0.55);
  --color-tcl04-ink: #242b3b;
  --color-tcl04-ink: oklch(0.29 0.03 265);
  --color-tcl04-mut: #4e586c;
  --color-tcl04-mut: oklch(0.46 0.035 265);
  --color-tcl04-clay: #b7c6ff;
  --color-tcl04-clay: oklch(0.84 0.1 275);
  --color-tcl04-soft: color-mix(in oklch, var(--color-tcl04-bg) 80%, white);
  --color-tcl04-warn: #a7391e;
  --color-tcl04-warn: oklch(0.5 0.15 35);
  --color-tcl04-ok: #006836;
  --color-tcl04-ok: oklch(0.45 0.12 155);
  --font-tcl04-display: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-tcl04-sans: 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-tcl04-mono: 'JetBrains Mono', ui-monospace, monospace;
  --shadow-tcl04-neu: -9px -9px 18px var(--color-tcl04-light), 9px 9px 20px var(--color-tcl04-shade);
  --shadow-tcl04-clay: 0 26px 46px -16px var(--color-tcl04-shade), inset 0 -16px 26px -12px var(--color-tcl04-shade), inset 0 18px 26px -8px var(--color-tcl04-light);
  --shadow-tcl04-btn: 0 10px 18px -12px var(--color-tcl04-shade), inset 0 -8px 12px -9px var(--color-tcl04-shade), inset 0 9px 12px -7px var(--color-tcl04-light);
  --shadow-tcl04-press: 0 4px 8px -8px var(--color-tcl04-shade), inset 0 8px 14px -8px var(--color-tcl04-shade), inset 0 -6px 12px -9px var(--color-tcl04-light);
  --shadow-tcl04-pill: 0 12px 22px -14px var(--color-tcl04-shade), inset 0 -8px 14px -10px var(--color-tcl04-shade), inset 0 10px 14px -8px var(--color-tcl04-light);
  --shadow-tcl04-track: inset 0 4px 8px -3px var(--color-tcl04-shade), inset 0 -3px 6px -3px var(--color-tcl04-light);
  --shadow-tcl04-knob: 0 4px 8px -3px var(--color-tcl04-shade), inset 0 -3px 5px -3px var(--color-tcl04-shade);
}
/* 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. */

.tcl-04 {
  width: 100%;
  min-height: 100svh;
}
```

How this works

Neumorphism fills the card with the page colour and draws two mirrored outset shadows. Claymorphism gives the card its own lighter fill, one drop, and two insets. As tokens:

--shadow-tcl04-neu:  -9px -9px 18px var(--light), 9px 9px 20px var(--shade);
--shadow-tcl04-clay: 0 26px 46px -16px var(--shade),
  inset 0 -16px 26px -12px var(--shade), inset 0 18px 26px -8px var(--light);

One switch, whole subtree. The root section is group/demo. The neu card, its button and its verdict each carry group-has-[#tcl-04-swap:checked]/demo: utilities, so a single checkbox anywhere inside re-skins them all — including the button radius the CSS version forgot.

Make it yours

  • Swap direction: move the variants to the clay card to preview clay content as neumorphism.
  • Tone down neu: halve the offsets (9px → 6px) for a subtler emboss.
  • Different clay hue: edit --color-tcl04-clay; the neu card is unaffected because it uses the page colour.

Gotchas — read before shipping

  • Neumorphism's object has no fill contrast against the page — its edge is shadow only, which fails WCAG 1.4.11 (3:1 non-text) for controls. That's the verdict on the card.
  • Transitioning between a 2-layer and a 3-layer shadow snaps; this demo accepts the snap for the swap and animates radius and fill instead.
  • role="switch" on a checkbox is valid ARIA and keeps native keyboard toggling.

Browser support

ChromeSafariFirefoxEdge
111+16.4+128+111+

:has() ships in all three engines inside Tailwind v4's floor.

Techniques used in this demo

Utilitiesfirst-class utility or variant

box-shadowtw ↗:has()tw ↗

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