HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS @keyframes Basic Example</title>
  <style>
    @keyframes colorChange {
      from {
        background-color: #2563eb;
      }
      to {
        background-color: #7c3aed;
      }
    }

    .box {
      width: 80px;
      height: 80px;
      border-radius: 0.5rem;
      animation: colorChange 2s ease-in-out infinite alternate;
    }

    body {
      margin: 0;
      padding: 1.5rem;
      font-family: system-ui, sans-serif;
      color: #1e293b;
    }
  </style>
</head>
<body>
  <h1>Basic @keyframes</h1>
  <p>The box fades between blue and purple.</p>
  <div class="box" aria-hidden="true"></div>
</body>
</html>

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CSS @keyframes - Basic from/to Animation