HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-block-size 50vh</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
      margin: 0;
    }
    .hero-card {
      max-block-size: 50vh;
      overflow: auto;
      padding: 1.5rem;
      background: #fef3c7;
      border: 1px solid #fcd34d;
      border-radius: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Viewport Cap: 50vh</h1>
  <div class="hero-card">
    <p>This card never grows taller than half the viewport height.</p>
    <p>Resize the browser window to see the cap change with viewport size.</p>
    <p>Paragraph three with extra sample text for scrolling on small screens.</p>
    <p>Paragraph four with extra sample text for scrolling on small screens.</p>
    <p>Paragraph five with extra sample text for scrolling on small screens.</p>
    <p>Paragraph six with extra sample text for scrolling on small screens.</p>
  </div>
</body>
</html>

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CSS max-block-size Property - 50vh Viewport Cap