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 max-width Example</title>
  <style>
    * {
      box-sizing: border-box;
    }

    body {
      font-family: system-ui, sans-serif;
      margin: 0;
      padding: 1.5rem;
      line-height: 1.6;
      background: #f1f5f9;
      color: #334155;
    }

    .card {
      width: 100%;
      max-width: 22rem;
      margin: 0 auto;
      padding: 1.25rem;
      border-radius: 0.5rem;
      background: #fff;
      border: 1px solid #cbd5e1;
      box-shadow: 0 4px 12px rgba(15, 23, 42, 0.06);
    }

    .card h2 {
      margin: 0 0 0.5rem;
      font-size: 1.125rem;
    }

    .card p {
      margin: 0;
      color: #64748b;
      font-size: 0.9375rem;
    }
  </style>
</head>
<body>
  <article class="card">
    <h2>Responsive card</h2>
    <p>width: 100% with max-width: 22rem keeps this card readable on large screens and full-width on small ones.</p>
  </article>
</body>
</html>

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CSS width Property - max-width Responsive Card