Exploding like buttonOne-line

GPT-6 Luna

by OpenAIReasoningClean

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Running live in a sandboxed frame. Click inside it before using the keyboard.

How it went

Total time: 22.2 s
Cost: $0.0016
Output tokens: 3,031
Spent thinking: 0 tokens
Speed: 144.8 tok/s
Console errors: 0

First token after: 1.2 s
First visible text after: 1.2 s
Prompt tokens: 356
Code size: 8.5 KB
Finish reason: stop
Served by: OpenAI
Model id: openai/gpt-6-luna
Reasoning sent: {"effort":"none"}
Max output: 64,000 tokens
Generated: Nov 10, 2026

What it was asked

The prompt

“a "like" button in pure CSS, no JavaScript, that does a crazy animation when you click it”

System prompt, sent with every prompt

You are generating a self-contained web demo. It will be rendered automatically in a sandboxed iframe and compared side by side with the output of other AI models given the exact same task.

Output rules:
- Reply with exactly ONE fenced code block containing the complete file: ```html (or ```svg when the task asks for an SVG). No text before or after the code block.
- Everything must be inline: CSS in <style>, JavaScript in <script>. No external files, images, fonts or network requests, except the CDN URLs explicitly allowed by the task.
- Do not use localStorage, sessionStorage, cookies, IndexedDB, alert(), confirm(), prompt() or window.open(): they are blocked in the sandbox and will throw.
- The page must look right in a 1280×800 viewport and adapt gracefully down to 375px wide. No horizontal scrollbar.
- Something meaningful must be visible on first paint: a screenshot is taken automatically about 3 seconds after load, without any interaction.
- Everything that makes the demo interesting must be visible within the first seconds: nothing hidden behind a high score, a later level or a long play session.
- Games must start in a self-playing demo mode (a simple AI plays) behind a "Click or press a key to start" message, so the game can be judged in action without playing.
- The iframe only receives keyboard events after the user clicks it: if the demo uses the keyboard, display a clear "Click or press a key to start" message.
- The code must run with zero errors in the console of the latest Chrome.

Code run-1.html · 275 lines

Download

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Like Button — Pure CSS</title>
<style>
  * { box-sizing: border-box; }
  body {
    margin: 0;
    min-height: 100vh;
    display: grid;
    place-items: center;
    overflow: hidden;
    color: #fff;
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
      radial-gradient(ellipse at 50% 42%, rgba(69, 34, 101, .48), transparent 40%),
      radial-gradient(ellipse at 16% 85%, rgba(16, 105, 132, .22), transparent 38%),
      #0b0a12;
  }
  .stage {
    width: min(100%, 760px);
    padding: 48px 24px;
    text-align: center;
  }
  .eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    margin-bottom: 18px;
    color: #a99cb8;
    font-size: 11px;
    font-weight: 750;
    letter-spacing: .2em;
    text-transform: uppercase;
  }
  .eyebrow::before, .eyebrow::after {
    content: "";
    width: 22px;
    height: 1px;
    background: #64546f;
  }
  h1 {
    margin: 0;
    font-size: clamp(34px, 7vw, 62px);
    letter-spacing: -.055em;
    line-height: 1;
    font-weight: 800;
  }
  .sub {
    margin: 17px 0 0;
    color: #a79eaf;
    font-size: 15px;
  }
  .button-wrap {
    position: relative;
    display: inline-grid;
    place-items: center;
    margin-top: 68px;
    isolation: isolate;
  }
  .like-input {
    position: absolute;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
  }
  .like-button {
    position: relative;
    z-index: 2;
    display: flex;
    align-items: center;
    gap: 15px;
    min-width: 232px;
    justify-content: center;
    padding: 19px 29px;
    border: 1px solid #ffffff28;
    border-radius: 999px;
    color: #ede8f1;
    background: linear-gradient(135deg, #282331, #191722);
    box-shadow: 0 14px 38px #0007, inset 0 1px #ffffff12;
    cursor: pointer;
    user-select: none;
    transition: transform .2s, background .35s, border-color .35s, box-shadow .35s;
    -webkit-tap-highlight-color: transparent;
  }
  .like-button:hover { transform: translateY(-3px); box-shadow: 0 20px 44px #0009, inset 0 1px #ffffff18; }
  .like-button:active { transform: scale(.94); }
  .like-input:focus-visible + .like-button {
    outline: 3px solid #f46b9b;
    outline-offset: 5px;
  }
  .heart {
    width: 30px;
    height: 30px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.2;
    stroke-linecap: round;
    stroke-linejoin: round;
    overflow: visible;
    transition: color .3s;
  }
  .button-text {
    min-width: 76px;
    font-size: 16px;
    font-weight: 750;
    letter-spacing: .01em;
  }
  .count {
    min-width: 28px;
    padding-left: 13px;
    border-left: 1px solid #ffffff2c;
    color: #b5aebe;
    font-variant-numeric: tabular-nums;
    font-size: 14px;
    font-weight: 650;
  }
  .count .liked-count { display: none; }
  .like-input:checked + .like-button {
    color: #fff;
    border-color: #ff6c9c8c;
    background: linear-gradient(135deg, #e9427a, #a82467);
    box-shadow: 0 14px 45px #e3326a55, inset 0 1px #ffffff4d;
  }
  .like-input:checked + .like-button .heart {
    fill: #fff;
    stroke: #fff;
    animation: heart-pop .7s cubic-bezier(.2,1.8,.45,1) both;
  }
  .like-input:checked + .like-button .button-text { animation: text-flash .45s ease-out; }
  .like-input:checked + .like-button .count { color: #ffe6ef; border-color: #ffffff5a; }
  .like-input:checked + .like-button .normal-count { display: none; }
  .like-input:checked + .like-button .liked-count { display: inline; }

  .burst {
    position: absolute;
    z-index: 1;
    inset: 50% auto auto 50%;
    width: 10px;
    height: 10px;
    pointer-events: none;
    opacity: 0;
  }
  .burst i {
    --angle: 0deg;
    --distance: 100px;
    --particle: #ff598c;
    position: absolute;
    top: 0;
    left: 0;
    width: 11px;
    height: 11px;
    background: var(--particle);
    border-radius: 3px;
    opacity: 0;
    transform: rotate(var(--angle)) translateY(0) scale(.2);
  }
  .burst i:nth-child(1) { --angle: 0deg; --distance: 120px; --particle: #ff527f; }
  .burst i:nth-child(2) { --angle: 45deg; --distance: 90px; --particle: #ffc65b; width: 8px; height: 8px; }
  .burst i:nth-child(3) { --angle: 90deg; --distance: 120px; --particle: #a78bfa; }
  .burst i:nth-child(4) { --angle: 135deg; --distance: 94px; --particle: #ff80a9; width: 7px; height: 7px; }
  .burst i:nth-child(5) { --angle: 180deg; --distance: 116px; --particle: #ffd06d; }
  .burst i:nth-child(6) { --angle: 225deg; --distance: 92px; --particle: #64e3d2; width: 8px; height: 8px; }
  .burst i:nth-child(7) { --angle: 270deg; --distance: 125px; --particle: #ff598c; }
  .burst i:nth-child(8) { --angle: 315deg; --distance: 100px; --particle: #b69cff; width: 7px; height: 7px; }
  .burst i:nth-child(9) { --angle: 22deg; --distance: 76px; --particle: #fff; width: 5px; height: 5px; border-radius: 50%; }
  .burst i:nth-child(10) { --angle: 112deg; --distance: 81px; --particle: #fff; width: 5px; height: 5px; border-radius: 50%; }
  .burst i:nth-child(11) { --angle: 202deg; --distance: 78px; --particle: #fff; width: 5px; height: 5px; border-radius: 50%; }
  .burst i:nth-child(12) { --angle: 292deg; --distance: 82px; --particle: #fff; width: 5px; height: 5px; border-radius: 50%; }
  .like-input:checked ~ .burst { opacity: 1; }
  .like-input:checked ~ .burst i { animation: shoot .8s cubic-bezier(.18,.7,.25,1) both; }

  .orbit {
    position: absolute;
    z-index: 0;
    width: 315px;
    height: 315px;
    border: 1px solid #f7639940;
    border-radius: 50%;
    opacity: 0;
    transform: scale(.15);
    pointer-events: none;
  }
  .orbit::before, .orbit::after {
    content: "";
    position: absolute;
    inset: 18px;
    border: 1px dashed #ffc16d55;
    border-radius: 50%;
  }
  .orbit::after { inset: 38px; border-color: #b49bff50; }
  .like-input:checked ~ .orbit { animation: ring .9s ease-out both; }

  .hint {
    margin-top: 42px;
    color: #776e80;
    font-size: 12px;
    letter-spacing: .03em;
  }
  .hint span { color: #b4a9bf; }
  .css-note {
    position: fixed;
    bottom: 22px;
    left: 0;
    right: 0;
    color: #585262;
    text-align: center;
    font-size: 11px;
    letter-spacing: .12em;
    text-transform: uppercase;
  }
  @keyframes heart-pop {
    0% { transform: scale(.2) rotate(-35deg); }
    38% { transform: scale(1.6) rotate(12deg); }
    58% { transform: scale(.78) rotate(-8deg); }
    78% { transform: scale(1.23) rotate(4deg); }
    100% { transform: scale(1) rotate(0); }
  }
  @keyframes text-flash {
    0% { transform: translateY(7px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
  }
  @keyframes shoot {
    0% { opacity: 0; transform: rotate(var(--angle)) translateY(0) scale(.15); }
    15% { opacity: 1; }
    75% { opacity: 1; }
    100% { opacity: 0; transform: rotate(var(--angle)) translateY(calc(var(--distance) * -1)) scale(.8) rotate(130deg); }
  }
  @keyframes ring {
    0% { opacity: 0; transform: scale(.15) rotate(-30deg); }
    18% { opacity: .9; }
    100% { opacity: 0; transform: scale(1.12) rotate(50deg); }
  }
  @media (max-width: 500px) {
    .stage { padding: 35px 18px; }
    .sub { font-size: 14px; }
    .button-wrap { margin-top: 58px; }
    .orbit { width: 270px; height: 270px; }
    .hint { margin-top: 34px; }
  }
  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
  }
</style>
</head>
<body>
  <main class="stage">
    <div class="eyebrow">A little appreciation</div>
    <h1>Make it count.</h1>
    <p class="sub">One click. An unreasonable amount of joy.</p>

    <div class="button-wrap">
      <input class="like-input" type="checkbox" id="like">
      <label class="like-button" for="like" aria-label="Like this">
        <svg class="heart" viewBox="0 0 24 24" aria-hidden="true">
          <path d="M20.8 8.8c0 5.4-8.8 11-8.8 11s-8.8-5.6-8.8-11a4.7 4.7 0 0 1 8.8-2.2 4.7 4.7 0 0 1 8.8 2.2Z"/>
        </svg>
        <span class="button-text">Like</span>
        <span class="count"><span class="normal-count">128</span><span class="liked-count">129</span></span>
      </label>
      <div class="burst" aria-hidden="true">
        <i></i><i></i><i></i><i></i><i></i><i></i>
        <i></i><i></i><i></i><i></i><i></i><i></i>
      </div>
      <div class="orbit" aria-hidden="true"></div>
    </div>

    <div class="hint"><span>Click the button</span> to unleash the confetti</div>
  </main>
  <div class="css-note">100% CSS · 0% restraint</div>
</body>
</html>