HTML Code

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

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

    div {
      height: 80px;
      overflow-y: auto;
      border: 1px solid #cbd5e1;
      padding: 8px;
    }
  </style>
</head>
<body>
  <p><strong>overflow-y: auto</strong> shows a vertical scrollbar only when the content is taller than the box.</p>
  <div>
    Line 1<br>
    Line 2<br>
    Line 3<br>
    Line 4<br>
    Line 5 — scrollbar appears because this overflows
  </div>
</body>
</html>

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CSS overflow-y Property — auto