HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-block-size Scroll Panel</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .panel {
      max-block-size: 150px;
      overflow-y: auto;
      padding: 1rem;
      background: #dbeafe;
      border-radius: 0.75rem;
      border: 1px solid #93c5fd;
    }
  </style>
</head>
<body>
  <h1>Scrollable Panel</h1>
  <div class="panel">
    <p>This panel caps at 150px along the block axis.</p>
    <p>Extra paragraphs scroll inside the box so the surrounding layout stays compact.</p>
    <p>Line three of sample content.</p>
    <p>Line four of sample content.</p>
    <p>Line five of sample content.</p>
  </div>
</body>
</html>

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CSS max-block-size Property - Scrollable Panel