HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS .card.featured Example</title>
  <style>
    .card {
      padding: 1rem 1.25rem;
      border: 1px solid #e2e8f0;
      border-radius: 10px;
      background: #fff;
      margin-bottom: 0.75rem;
      color: #334155;
    }

    .card.featured {
      border-color: #f59e0b;
      background: #fffbeb;
      box-shadow: 0 4px 14px rgba(245, 158, 11, 0.15);
    }

    .card.featured h2 {
      color: #b45309;
      margin: 0 0 0.35rem;
      font-size: 1.1rem;
    }
  </style>
</head>
<body>
  <div class="card">
    <h2>Regular Card</h2>
    <p>Standard styling for all cards.</p>
  </div>

  <div class="card featured">
    <h2>Featured Card</h2>
    <p>Matches .card.featured — both classes required.</p>
  </div>
</body>
</html>

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CSS Chained Class Selector (.class1.class2)