HTML Code

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

    div.card {
      border: 1px solid #cbd5e1;
      padding: 12px;
      border-radius: 8px;
    }
  </style>
</head>
<body>
  <div class="card">Styled card</div>
  <article class="card">Same class on article</article>
</body>
</html>

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CSS element.class — div.card