HTML Code

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

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .card {
      margin-bottom: 24px;
      padding: 10px;
      border: 2px solid #3b82f6;
      background: #eff6ff;
      max-width: 12rem;
    }

    .next {
      padding: 10px;
      border: 2px solid #3b82f6;
      background: #eff6ff;
      max-width: 12rem;
    }
  </style>
</head>
<body>
  <p><strong>margin-bottom: 24px</strong> adds outer space below the first box.</p>
  <div class="card">Card</div>
  <div class="next">Next</div>
</body>
</html>

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CSS margin-bottom Property — length