HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>CSS transition-duration Comparison</title>

  <style>

    body {

      font-family: system-ui, sans-serif;

      padding: 20px;

      background: #f8fafc;

      color: #334155;

    }



    .row {

      display: flex;

      flex-wrap: wrap;

      gap: 2rem;

      margin-top: 1rem;

    }



    .demo {

      text-align: center;

    }



    .bar {

      width: 80px;

      height: 80px;

      border-radius: 0.35rem;

      background: #7c3aed;

      transition-property: transform;

    }



    .demo:hover .bar {

      transform: scale(1.3);

    }



    .fast .bar { transition-duration: 0.2s; }

    .slow .bar { transition-duration: 2s; }

  </style>

</head>

<body>

  <h1>Fast vs Slow Duration</h1>

  <p>Hover each box to feel the difference.</p>

  <div class="row">

    <div class="demo fast">

      <div class="bar"></div>

      <small>0.2s — snappy</small>

    </div>

    <div class="demo slow">

      <div class="bar"></div>

      <small>2s — gradual</small>

    </div>

  </div>

</body>

</html>

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CSS transition-duration Property - Fast vs Slow