HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS Scoped * Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      color: #334155;
    }

    .card * {
      margin: 0;
    }

    .card {
      padding: 1rem;
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
      background: #f8fafc;
      max-width: 18rem;
    }

    .card h3 {
      margin-bottom: 0.35rem;
      color: #1e293b;
      font-size: 1rem;
    }

    .card p {
      font-size: 0.875rem;
      color: #64748b;
      line-height: 1.55;
    }

    /* Outside card — browser defaults remain */
    h2 {
      margin-bottom: 0.75rem;
      font-size: 1.125rem;
    }
  </style>
</head>
<body>
  <h2>Outside the card (normal margins)</h2>
  <div class="card">
    <h3>Card Title</h3>
    <p>Only elements inside .card have margins reset by .card *.</p>
  </div>
</body>
</html>

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CSS * Selector - Scoped .card *