Pure TailwindMIT licensed

Tailwind Underline Slide Nav Hover Effect

Six navigation underline styles — grow from left, expand from centre, an overline that switches origin mid-interaction, a double line, a thick highlight and a dot indicator. Six navs, one anchor recipe, one changed utility each.

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The code

<section class="thv-25 w-full min-h-svh bg-thv25-bg font-thv25-sans px-8 py-12 flex flex-col gap-11">
  <p class="text-center text-[0.72rem] tracking-[0.15em] uppercase text-thv25-dim">Underline Slide Nav — 6 Styles</p>

  <nav aria-label="Grow from left" class="flex flex-wrap items-center gap-8">
    <a href="#" aria-current="page" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc aria-[current=page]:text-white after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 aria-[current=page]:after:scale-x-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Grow from Left</span>
  </nav>

  <nav aria-label="Expand from centre" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Expand from Centre</span>
  </nav>

  <nav aria-label="Top overline" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">Home</a>
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">About</a>
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">Work</a>
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Top Overline</span>
  </nav>

  <nav aria-label="Double line" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Double Line</span>
  </nav>

  <nav aria-label="Thick fill highlight" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Thick Fill Highlight</span>
  </nav>

  <nav aria-label="Dot indicator" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Dot Indicator</span>
  </nav>
</section>
@import "tailwindcss";

@theme {
  --color-thv25-bg: #0b0b0f;
  --color-thv25-bg: oklch(0.13 0.01 285);
  --color-thv25-ink: #cccccc;
  --color-thv25-ink: oklch(0.83 0 0);
  --color-thv25-dim: #8a8a94;
  --color-thv25-dim: oklch(0.64 0.01 285);
  --color-thv25-acc: #7c6af7;
  --color-thv25-acc: oklch(0.62 0.2 285);
  --font-thv25-sans: 'Space Grotesk', system-ui, sans-serif;
}

.thv-25 {
  width: 100%;
  min-height: 100svh;
}

.thv-25 ::selection {
  background: var(--color-thv25-acc);
  color: #fff;
}

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-thv25-bg: #0b0b0f;
  --color-thv25-bg: oklch(0.13 0.01 285);
  --color-thv25-ink: #cccccc;
  --color-thv25-ink: oklch(0.83 0 0);
  --color-thv25-dim: #8a8a94;
  --color-thv25-dim: oklch(0.64 0.01 285);
  --color-thv25-acc: #7c6af7;
  --color-thv25-acc: oklch(0.62 0.2 285);
  --font-thv25-sans: 'Space Grotesk', system-ui, sans-serif;
}

.thv-25 {
  width: 100%;
  min-height: 100svh;
}

.thv-25 ::selection {
  background: var(--color-thv25-acc);
  color: #fff;
}
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=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;800&display=swap">

What changed in the port

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

  • Six navs, one anchor recipe: the diff between "grow from left" and "expand from centre" is literally after:origin-left vs after:origin-center.
  • UI change from the CSS original: every nav is a real <nav aria-label>, every link has a focus-visible: twin plus a ring, and the first nav marks its active item with aria-current="page" styled through aria-[current=page]: — the source had no active state at all.
  • The :has() shared-slider variant from the source was dropped in favour of the attribute-driven active state: it needed no new browser floor and expresses the same idea more honestly.
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 Underline Slide Nav Hover Effect
Source: https://codefronts.com/motion/tailwind-css-hover-effects/tailwind-underline-slide-nav-hover-effect/

Six navigation underline styles — grow from left, expand from centre, an overline that switches origin mid-interaction, a double line, a thick highlight and a dot indicator. Six navs, one anchor recipe, one changed utility each.
## HTML
```html
<section class="thv-25 w-full min-h-svh bg-thv25-bg font-thv25-sans px-8 py-12 flex flex-col gap-11">
  <p class="text-center text-[0.72rem] tracking-[0.15em] uppercase text-thv25-dim">Underline Slide Nav — 6 Styles</p>

  <nav aria-label="Grow from left" class="flex flex-wrap items-center gap-8">
    <a href="#" aria-current="page" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc aria-[current=page]:text-white after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 aria-[current=page]:after:scale-x-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Grow from Left</span>
  </nav>

  <nav aria-label="Expand from centre" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative pb-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-center after:scale-x-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.4,0,.2,1)] hover:after:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Expand from Centre</span>
  </nav>

  <nav aria-label="Top overline" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">Home</a>
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">About</a>
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">Work</a>
    <a href="#" class="relative pt-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-300 before:ease-[cubic-bezier(.4,0,.2,1)] hover:before:scale-x-100 hover:before:origin-left focus-visible:before:scale-x-100 focus-visible:before:origin-left motion-reduce:before:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Top Overline</span>
  </nav>

  <nav aria-label="Double line" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc before:content-[''] before:absolute before:inset-x-0 before:top-0 before:h-0.5 before:bg-thv25-acc before:origin-right before:scale-x-0 before:transition-transform before:duration-350 after:content-[''] after:absolute after:inset-x-0 after:bottom-0 after:h-0.5 after:bg-thv25-acc after:origin-left after:scale-x-0 after:transition-transform after:duration-350 hover:before:scale-x-100 hover:after:scale-x-100 focus-visible:before:scale-x-100 focus-visible:after:scale-x-100 motion-reduce:before:transition-none motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Double Line</span>
  </nav>

  <nav aria-label="Thick fill highlight" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative isolate px-1.5 py-1 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:-inset-x-1.5 after:-bottom-0.5 after:-z-10 after:h-[34px] after:rounded after:bg-thv25-acc after:origin-bottom after:scale-y-0 after:transition-transform after:duration-300 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-y-100 focus-visible:after:scale-y-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Thick Fill Highlight</span>
  </nav>

  <nav aria-label="Dot indicator" class="flex flex-wrap items-center gap-8">
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">Home</a>
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">About</a>
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">Work</a>
    <a href="#" class="relative pb-2 text-[0.95rem] font-medium text-thv25-ink no-underline transition-colors duration-250 rounded-xs hover:text-white focus-visible:text-white focus-visible:outline-2 focus-visible:outline-offset-4 focus-visible:outline-thv25-acc after:content-[''] after:absolute after:bottom-0 after:left-1/2 after:w-[5px] after:h-[5px] after:rounded-full after:bg-thv25-acc after:-translate-x-1/2 after:scale-0 after:transition-transform after:duration-250 after:ease-[cubic-bezier(.34,1.56,.64,1)] hover:after:scale-100 focus-visible:after:scale-100 motion-reduce:after:transition-none">Contact</a>
    <span class="ml-auto text-[0.68rem] tracking-[0.1em] uppercase text-thv25-dim">Dot Indicator</span>
  </nav>
</section>
```
## CSS
```css
@import "tailwindcss";

@theme {
  --color-thv25-bg: #0b0b0f;
  --color-thv25-bg: oklch(0.13 0.01 285);
  --color-thv25-ink: #cccccc;
  --color-thv25-ink: oklch(0.83 0 0);
  --color-thv25-dim: #8a8a94;
  --color-thv25-dim: oklch(0.64 0.01 285);
  --color-thv25-acc: #7c6af7;
  --color-thv25-acc: oklch(0.62 0.2 285);
  --font-thv25-sans: 'Space Grotesk', system-ui, sans-serif;
}

.thv-25 {
  width: 100%;
  min-height: 100svh;
}

.thv-25 ::selection {
  background: var(--color-thv25-acc);
  color: #fff;
}
```

How this works

One recipe, six parameters. Every link is relative pb-1 with an after: bar; the variants change the origin, the axis, the position or the size. That is the case for utilities in a nutshell — the variation is visible as a diff.

The overline's trick survives. before:origin-right at rest and hover:before:origin-left means the bar draws in from the left and retracts to the right, which feels directional rather than elastic.

Active state is an attribute. The current page carries aria-current="page" and styles from aria-[current=page]:, so semantics and appearance cannot drift apart.

Make it yours

  • Retint through --color-thv25-acc; every variant reads it.
  • Thicker bars: after:h-0.5 → after:h-[3px].
  • Springier dot: raise the overshoot in cubic-bezier(.34,1.56,.64,1).

Gotchas — read before shipping

  • scale-x composites; animating width does not. Prefer the transform.
  • The thick highlight needs isolate on the link so after:-z-10 stays inside it.
  • Every hover: here has a focus-visible: twin — a nav whose only affordance is hover is unusable by keyboard.

Browser support

ChromeSafariFirefoxEdge
111+16.4+128+111+

Baseline transforms and pseudo-elements; the floor is Tailwind v4's generated sheet.

Techniques used in this demo

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