HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>animation-timing-function: cubic-bezier</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    @keyframes slide {
      from { transform: translateX(0); }
      to { transform: translateX(80px); }
    }

    .row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .card {
      flex: 1 1 260px;
    }

    .label {
      margin: 0 0 8px;
      font-weight: 700;
    }

    .track {
      display: flex;
      align-items: center;
      box-sizing: border-box;
      height: 120px;
      padding: 8px;
      overflow: hidden;
      background: #e2e8f0;
      border: 2px dashed #334155;
    }

    .box {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 72px;
      height: 72px;
      background: #0f766e;
      color: #fff;
      font-weight: 700;
      animation-name: slide;
      animation-duration: 2s;
      animation-iteration-count: infinite;
    }

    .even { animation-timing-function: linear; }
    .curve { animation-timing-function: cubic-bezier(0.2, 1.4, 0.2, 1); }
  </style>
</head>
<body>
  <p>The second number, <strong>1.4</strong>, is above 1, so the custom curve goes past the end and comes back. The first and third numbers stay between 0 and 1. An x outside that range would drop the declaration.</p>
  <div class="row">
    <div class="card">
      <p class="label">animation-timing-function: linear</p>
      <div class="track"><div class="box even">Linear</div></div>
    </div>
    <div class="card">
      <p class="label">cubic-bezier(0.2, 1.4, 0.2, 1)</p>
      <div class="track"><div class="box curve">Curve</div></div>
    </div>
  </div>
</body>
</html>

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CSS animation-timing-function Property — cubic-bezier