36 CSS Search Bars36 / 36

Pure CSSMIT licensed

Aurora Gradient CSS Search Bar

The "AI product" field: a slow aurora of teal, violet and rose drifting around the border while a soft bloom of the same hues pools underneath. Driven by an @property-registered <angle> so a conic gradient can actually animate — the technique that makes this look impossible in plain CSS.

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The code

<div class="sb-36">
  <button class="sb-36__theme" type="button" aria-pressed="false" aria-label="Switch to dark theme">
    <svg class="sb-36__moon" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M20 14.2A8.2 8.2 0 0 1 9.8 4 8.4 8.4 0 1 0 20 14.2"/></svg>
    <svg class="sb-36__sun" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><circle cx="12" cy="12" r="4"/><path d="M12 3.4v2M12 18.6v2M3.4 12h2M18.6 12h2M6 6l1.4 1.4M16.6 16.6 18 18M18 6l-1.4 1.4M7.4 16.6 6 18"/></svg>
  </button>
  <div class="sb-36__stage">
    <div class="sb-36__wrap">
      <span class="sb-36__glow" aria-hidden="true"></span>
      <div class="sb-36__bar" role="search">
        <svg class="sb-36__ico" viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><path d="M12 3.6l1.6 4.4 4.4 1.6-4.4 1.6L12 15.6l-1.6-4.4L6 9.6l4.4-1.6z" stroke="currentColor" stroke-width="1.6" stroke-linejoin="round"/><path d="M18.4 15.2l.8 2.2 2.2.8-2.2.8-.8 2.2-.8-2.2-2.2-.8 2.2-.8z" stroke="currentColor" stroke-width="1.3" stroke-linejoin="round"/></svg>
        <label class="sb-36__vh" for="sb-36-input">Ask or search anything</label>
        <input class="sb-36__input" id="sb-36-input" type="search" placeholder="Ask anything, or search your workspace" autocomplete="off">
        <button class="sb-36__go" type="button" aria-label="Submit">
          <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><path d="M12 19V5m-6 6 6-6 6 6" stroke="currentColor" stroke-width="2.1" stroke-linecap="round" stroke-linejoin="round"/></svg>
        </button>
      </div>
    </div>
  </div>
</div>
@property --sb-36-a {
  syntax: '<angle>';
  inherits: true;
  initial-value: 0deg;
}

.sb-36 {
  --bg: #08090f;
  --card: #101219;
  --ink: #f0f2f8;
  --muted: #8990a4;
  --line: #232838;
  --c1: #2dd4bf;
  --c2: #8b5cf6;
  --c3: #fb7185;
  --c4: #38bdf8;
  --ring: #8b5cf6;
  --sb-36-a: 0deg;
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: block;
  box-sizing: border-box;
  font-family: system-ui,-apple-system,"Segoe UI",sans-serif;
  color: var(--ink);
  background: radial-gradient(50rem 30rem at 50% 120%, rgba(139,92,246,.16), transparent 66%), var(--bg);
  -webkit-font-smoothing: antialiased;
}

.sb-36 *,
.sb-36 *::before,
.sb-36 *::after {
  box-sizing: border-box;
}

.sb-36__stage {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(1rem,4vw,3rem);
}

.sb-36__vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sb-36__wrap {
  position: relative;
  inline-size: min(34rem,100%);
}

.sb-36__glow {
  position: absolute;
  inset: -6px 6px 0;
  z-index: 0;
  border-radius: 22px;
  opacity: .5;
  background: conic-gradient(from var(--sb-36-a), var(--c1), var(--c2) 30%, var(--c3) 58%, var(--c4) 80%, var(--c1));
  filter: blur(22px);
  pointer-events: none;
}

.sb-36__bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: .8rem;
  min-block-size: 62px;
  padding-inline: 1.15rem .5rem;
  border: 2px solid transparent;
  border-radius: 18px;
  background: linear-gradient(var(--card), var(--card)) padding-box, conic-gradient(from var(--sb-36-a), var(--c1), var(--c2) 30%, var(--c3) 58%, var(--c4) 80%, var(--c1)) border-box;
  transition: box-shadow .25s;
}

@supports not (background-clip: padding-box) {
  .sb-36__bar {
    border-color: var(--c2);
    background: var(--card);
  }
}

.sb-36__wrap:hover .sb-36__bar,
.sb-36__wrap:focus-within .sb-36__bar {
  animation: sb-36-drift 9s linear infinite;
}

.sb-36__wrap:hover .sb-36__glow,
.sb-36__wrap:focus-within .sb-36__glow {
  animation: sb-36-drift 14s linear infinite reverse;
  opacity: .72;
}

@keyframes sb-36-drift {
  to {
    --sb-36-a: 360deg;
  }
}

.sb-36__wrap:focus-within .sb-36__bar {
  box-shadow: 0 0 0 4px rgba(139,92,246,.16);
}

.sb-36__ico {
  inline-size: 21px;
  block-size: 21px;
  flex: none;
  color: var(--c1);
}

.sb-36__input {
  flex: 1;
  min-inline-size: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font: 400 1rem/1 inherit;
}

.sb-36__input::placeholder {
  color: var(--muted);
}

.sb-36__input:focus {
  outline: none;
}

.sb-36__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.sb-36__go {
  display: grid;
  place-items: center;
  inline-size: 46px;
  block-size: 46px;
  flex: none;
  border: 0;
  border-radius: 13px;
  background: linear-gradient(140deg, var(--c2), var(--c1));
  color: #08090f;
  cursor: pointer;
  transition: filter .18s, scale .12s;
}

.sb-36__go:hover {
  filter: brightness(1.12);
}

.sb-36__go:active {
  scale: .95;
}

.sb-36__go svg {
  inline-size: 19px;
  block-size: 19px;
}

.sb-36 :focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.sb-36__input:focus-visible {
  outline: none;
}

.sb-36[data-theme="light"] {
  --bg: #f7f7fb;
  --card: #ffffff;
  --ink: #12141c;
  --muted: #6b7183;
  --line: #e5e7f0;
  --c1: #0d9488;
  --c2: #7c3aed;
  --c3: #e11d48;
  --c4: #0284c7;
  --ring: #7c3aed;
  background: radial-gradient(50rem 30rem at 50% 120%, rgba(124,58,237,.10), transparent 66%), var(--bg);
}

.sb-36[data-theme="light"] .sb-36__glow {
  opacity: .34;
}

.sb-36[data-theme="light"] .sb-36__go {
  color: #fff;
}

@media (prefers-color-scheme: light) {
  .sb-36:not([data-theme="dark"]) {
    --bg: #f7f7fb;
    --card: #ffffff;
    --ink: #12141c;
    --muted: #6b7183;
    --line: #e5e7f0;
    --c1: #0d9488;
    --c2: #7c3aed;
    --c3: #e11d48;
    --c4: #0284c7;
    --ring: #7c3aed;
    background: radial-gradient(50rem 30rem at 50% 120%, rgba(124,58,237,.10), transparent 66%), var(--bg);
  }

  .sb-36:not([data-theme="dark"]) .sb-36__glow {
    opacity: .34;
  }

  .sb-36:not([data-theme="dark"]) .sb-36__go {
    color: #fff;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sb-36 *,
    .sb-36 *::before,
    .sb-36 *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .sb-36__bar {
    border: 2px solid CanvasText;
    background: Canvas;
  }

  .sb-36__glow {
    display: none;
  }
}

.sb-36__theme {
  position: absolute;
  inset-block-start: clamp(.75rem,2vw,1.25rem);
  inset-inline-end: clamp(.75rem,2vw,1.25rem);
  z-index: 50;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,.12);
  color: currentColor;
  background: rgba(255,255,255,.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background .25s ease, transform .25s cubic-bezier(.16,1,.3,1), border-color .25s ease;
}

.sb-36[data-theme="dark"] .sb-36__theme {
  background: rgba(20,20,28,.72);
  border-color: rgba(255,255,255,.15);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .sb-36:not([data-theme="light"]) .sb-36__theme {
    background: rgba(20,20,28,.72);
    border-color: rgba(255,255,255,.15);
    color: #fff;
  }
}

.sb-36__theme:hover {
  transform: translateY(-1px);
  border-color: rgba(0,0,0,.24);
}

.sb-36[data-theme="dark"] .sb-36__theme:hover,
.sb-36:not([data-theme="light"]) .sb-36__theme:hover {
  border-color: rgba(255,255,255,.3);
}

.sb-36__theme:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.sb-36__theme svg {
  grid-area: 1/1;
  inline-size: 1.1rem;
  block-size: 1.1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sb-36__sun {
  display: none;
}

.sb-36__theme[aria-pressed="true"] .sb-36__sun {
  display: block;
}

.sb-36__theme[aria-pressed="true"] .sb-36__moon {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .sb-36__theme {
    transition: none;
  }

  .sb-36__theme:hover {
    transform: none;
  }
}
(()=>{const r=document.querySelector('.sb-36');if(!r)return;const t=r.querySelector('.sb-36__theme');if(!t)return;const dark=()=>(r.dataset.theme||(matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light'))==='dark';const sync=()=>{t.setAttribute('aria-pressed',String(dark()));t.setAttribute('aria-label',dark()?'Switch to light theme':'Switch to dark theme');};t.addEventListener('click',()=>{r.dataset.theme=dark()?'light':'dark';sync();});matchMedia('(prefers-color-scheme: dark)').addEventListener('change',()=>{if(!r.dataset.theme)sync();});sync();})();
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 Search Bar 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: Aurora Gradient CSS Search Bar
Source: https://codefronts.com/components/css-search-boxes/aurora-drift/

The "AI product" field: a slow aurora of teal, violet and rose drifting around the border while a soft bloom of the same hues pools underneath. Driven by an @property-registered <angle> so a conic gradient can actually animate — the technique that makes this look impossible in plain CSS.
## HTML
```html
<div class="sb-36">
  <button class="sb-36__theme" type="button" aria-pressed="false" aria-label="Switch to dark theme">
    <svg class="sb-36__moon" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M20 14.2A8.2 8.2 0 0 1 9.8 4 8.4 8.4 0 1 0 20 14.2"/></svg>
    <svg class="sb-36__sun" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><circle cx="12" cy="12" r="4"/><path d="M12 3.4v2M12 18.6v2M3.4 12h2M18.6 12h2M6 6l1.4 1.4M16.6 16.6 18 18M18 6l-1.4 1.4M7.4 16.6 6 18"/></svg>
  </button>
  <div class="sb-36__stage">
    <div class="sb-36__wrap">
      <span class="sb-36__glow" aria-hidden="true"></span>
      <div class="sb-36__bar" role="search">
        <svg class="sb-36__ico" viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><path d="M12 3.6l1.6 4.4 4.4 1.6-4.4 1.6L12 15.6l-1.6-4.4L6 9.6l4.4-1.6z" stroke="currentColor" stroke-width="1.6" stroke-linejoin="round"/><path d="M18.4 15.2l.8 2.2 2.2.8-2.2.8-.8 2.2-.8-2.2-2.2-.8 2.2-.8z" stroke="currentColor" stroke-width="1.3" stroke-linejoin="round"/></svg>
        <label class="sb-36__vh" for="sb-36-input">Ask or search anything</label>
        <input class="sb-36__input" id="sb-36-input" type="search" placeholder="Ask anything, or search your workspace" autocomplete="off">
        <button class="sb-36__go" type="button" aria-label="Submit">
          <svg viewBox="0 0 24 24" fill="none" aria-hidden="true" focusable="false"><path d="M12 19V5m-6 6 6-6 6 6" stroke="currentColor" stroke-width="2.1" stroke-linecap="round" stroke-linejoin="round"/></svg>
        </button>
      </div>
    </div>
  </div>
</div>
```
## CSS
```css
@property --sb-36-a {
  syntax: '<angle>';
  inherits: true;
  initial-value: 0deg;
}

.sb-36 {
  --bg: #08090f;
  --card: #101219;
  --ink: #f0f2f8;
  --muted: #8990a4;
  --line: #232838;
  --c1: #2dd4bf;
  --c2: #8b5cf6;
  --c3: #fb7185;
  --c4: #38bdf8;
  --ring: #8b5cf6;
  --sb-36-a: 0deg;
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  display: block;
  box-sizing: border-box;
  font-family: system-ui,-apple-system,"Segoe UI",sans-serif;
  color: var(--ink);
  background: radial-gradient(50rem 30rem at 50% 120%, rgba(139,92,246,.16), transparent 66%), var(--bg);
  -webkit-font-smoothing: antialiased;
}

.sb-36 *,
.sb-36 *::before,
.sb-36 *::after {
  box-sizing: border-box;
}

.sb-36__stage {
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: clamp(1rem,4vw,3rem);
}

.sb-36__vh {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.sb-36__wrap {
  position: relative;
  inline-size: min(34rem,100%);
}

.sb-36__glow {
  position: absolute;
  inset: -6px 6px 0;
  z-index: 0;
  border-radius: 22px;
  opacity: .5;
  background: conic-gradient(from var(--sb-36-a), var(--c1), var(--c2) 30%, var(--c3) 58%, var(--c4) 80%, var(--c1));
  filter: blur(22px);
  pointer-events: none;
}

.sb-36__bar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: .8rem;
  min-block-size: 62px;
  padding-inline: 1.15rem .5rem;
  border: 2px solid transparent;
  border-radius: 18px;
  background: linear-gradient(var(--card), var(--card)) padding-box, conic-gradient(from var(--sb-36-a), var(--c1), var(--c2) 30%, var(--c3) 58%, var(--c4) 80%, var(--c1)) border-box;
  transition: box-shadow .25s;
}

@supports not (background-clip: padding-box) {
  .sb-36__bar {
    border-color: var(--c2);
    background: var(--card);
  }
}

.sb-36__wrap:hover .sb-36__bar,
.sb-36__wrap:focus-within .sb-36__bar {
  animation: sb-36-drift 9s linear infinite;
}

.sb-36__wrap:hover .sb-36__glow,
.sb-36__wrap:focus-within .sb-36__glow {
  animation: sb-36-drift 14s linear infinite reverse;
  opacity: .72;
}

@keyframes sb-36-drift {
  to {
    --sb-36-a: 360deg;
  }
}

.sb-36__wrap:focus-within .sb-36__bar {
  box-shadow: 0 0 0 4px rgba(139,92,246,.16);
}

.sb-36__ico {
  inline-size: 21px;
  block-size: 21px;
  flex: none;
  color: var(--c1);
}

.sb-36__input {
  flex: 1;
  min-inline-size: 0;
  border: 0;
  background: none;
  color: var(--ink);
  font: 400 1rem/1 inherit;
}

.sb-36__input::placeholder {
  color: var(--muted);
}

.sb-36__input:focus {
  outline: none;
}

.sb-36__input::-webkit-search-cancel-button {
  -webkit-appearance: none;
  appearance: none;
}

.sb-36__go {
  display: grid;
  place-items: center;
  inline-size: 46px;
  block-size: 46px;
  flex: none;
  border: 0;
  border-radius: 13px;
  background: linear-gradient(140deg, var(--c2), var(--c1));
  color: #08090f;
  cursor: pointer;
  transition: filter .18s, scale .12s;
}

.sb-36__go:hover {
  filter: brightness(1.12);
}

.sb-36__go:active {
  scale: .95;
}

.sb-36__go svg {
  inline-size: 19px;
  block-size: 19px;
}

.sb-36 :focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 3px;
}

.sb-36__input:focus-visible {
  outline: none;
}

.sb-36[data-theme="light"] {
  --bg: #f7f7fb;
  --card: #ffffff;
  --ink: #12141c;
  --muted: #6b7183;
  --line: #e5e7f0;
  --c1: #0d9488;
  --c2: #7c3aed;
  --c3: #e11d48;
  --c4: #0284c7;
  --ring: #7c3aed;
  background: radial-gradient(50rem 30rem at 50% 120%, rgba(124,58,237,.10), transparent 66%), var(--bg);
}

.sb-36[data-theme="light"] .sb-36__glow {
  opacity: .34;
}

.sb-36[data-theme="light"] .sb-36__go {
  color: #fff;
}

@media (prefers-color-scheme: light) {
  .sb-36:not([data-theme="dark"]) {
    --bg: #f7f7fb;
    --card: #ffffff;
    --ink: #12141c;
    --muted: #6b7183;
    --line: #e5e7f0;
    --c1: #0d9488;
    --c2: #7c3aed;
    --c3: #e11d48;
    --c4: #0284c7;
    --ring: #7c3aed;
    background: radial-gradient(50rem 30rem at 50% 120%, rgba(124,58,237,.10), transparent 66%), var(--bg);
  }

  .sb-36:not([data-theme="dark"]) .sb-36__glow {
    opacity: .34;
  }

  .sb-36:not([data-theme="dark"]) .sb-36__go {
    color: #fff;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sb-36 *,
    .sb-36 *::before,
    .sb-36 *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (forced-colors: active) {
  .sb-36__bar {
    border: 2px solid CanvasText;
    background: Canvas;
  }

  .sb-36__glow {
    display: none;
  }
}

.sb-36__theme {
  position: absolute;
  inset-block-start: clamp(.75rem,2vw,1.25rem);
  inset-inline-end: clamp(.75rem,2vw,1.25rem);
  z-index: 50;
  inline-size: 2.5rem;
  block-size: 2.5rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  border-radius: 999px;
  border: 1px solid rgba(0,0,0,.12);
  color: currentColor;
  background: rgba(255,255,255,.72);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  transition: background .25s ease, transform .25s cubic-bezier(.16,1,.3,1), border-color .25s ease;
}

.sb-36[data-theme="dark"] .sb-36__theme {
  background: rgba(20,20,28,.72);
  border-color: rgba(255,255,255,.15);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .sb-36:not([data-theme="light"]) .sb-36__theme {
    background: rgba(20,20,28,.72);
    border-color: rgba(255,255,255,.15);
    color: #fff;
  }
}

.sb-36__theme:hover {
  transform: translateY(-1px);
  border-color: rgba(0,0,0,.24);
}

.sb-36[data-theme="dark"] .sb-36__theme:hover,
.sb-36:not([data-theme="light"]) .sb-36__theme:hover {
  border-color: rgba(255,255,255,.3);
}

.sb-36__theme:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 3px;
}

.sb-36__theme svg {
  grid-area: 1/1;
  inline-size: 1.1rem;
  block-size: 1.1rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sb-36__sun {
  display: none;
}

.sb-36__theme[aria-pressed="true"] .sb-36__sun {
  display: block;
}

.sb-36__theme[aria-pressed="true"] .sb-36__moon {
  display: none;
}

@media (prefers-reduced-motion: reduce) {
  .sb-36__theme {
    transition: none;
  }

  .sb-36__theme:hover {
    transform: none;
  }
}
```

## JavaScript
```js
(()=>{const r=document.querySelector('.sb-36');if(!r)return;const t=r.querySelector('.sb-36__theme');if(!t)return;const dark=()=>(r.dataset.theme||(matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light'))==='dark';const sync=()=>{t.setAttribute('aria-pressed',String(dark()));t.setAttribute('aria-label',dark()?'Switch to light theme':'Switch to dark theme');};t.addEventListener('click',()=>{r.dataset.theme=dark()?'light':'dark';sync();});matchMedia('(prefers-color-scheme: dark)').addEventListener('change',()=>{if(!r.dataset.theme)sync();});sync();})();
```

How this works

Registering the angle is the unlock. Un-registered custom properties are strings, and strings cannot interpolate, which is why @keyframes on a raw --angle snaps instead of sweeping:

@property --sb-36-a{syntax:'<angle>'; inherits:true; initial-value:0deg;}
@keyframes sb-36-drift{to{--sb-36-a:360deg;}}

Two layers, two speeds. The border gradient runs at 9s and the blurred bloom behind it at 14s in the opposite direction. Because the periods do not divide evenly, the pattern takes minutes to repeat — the eye reads it as organic:

.sb-36__bar{animation:sb-36-drift 9s linear infinite;}
.sb-36__glow{animation:sb-36-drift 14s linear infinite reverse; filter:blur(22px); opacity:.55;}

The bloom is simply the same conic gradient on an absolutely-positioned element inset behind the field, blurred hard. Blur once on a static layer, then rotate — never animate the blur itself.

Restraint: the aurora only moves on hover or focus. A permanently animating gradient in a product UI is a battery cost and a distraction; here it rewards interaction instead.

Make it yours

  • Pick three or four hues 90-120° apart and repeat the first at the end so the conic loop is seamless.
  • Slow to 16-20s for an ambient hero treatment; speed to 4s for an "AI thinking" state.
  • Intensity lives in the bloom: opacity .35 is subtle, .7 is a showpiece.
  • To make it always-on, move the animation off the hover/focus selectors — but keep the reduced-motion block.

Gotchas — read before shipping

  • Without @property the angle will not interpolate; the demo's @supports fallback shows a static gradient rather than a broken jitter.
  • Blurred layers are fill-rate expensive — one per page is fine, twenty in a list is not.
  • Keep the input text on a solid opaque fill; type over an animated gradient is unreadable and fails contrast.
  • Do not put overflow:hidden on the bar: the bloom sits outside its box and would be clipped away.

Browser support

ChromeSafariFirefoxEdge
85+16.4+128+85+

@property is Chrome 85 / Safari 16.4 / Firefox 128 — the whole animation depends on it and is gated behind @supports, with a static gradient border elsewhere. background-clip layering and conic-gradient are baseline (Chrome 69 / Safari 12.1 / Firefox 83).

Techniques used in this demo

@propertyMDN ↗:focus-withinMDN ↗conic-gradient()MDN ↗filterMDN ↗backdrop-filterMDN ↗clip-pathMDN ↗

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