HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-block-size 400px</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .box {
      max-block-size: 400px;
      overflow: auto;
      background-color: lightgray;
      padding: 1rem;
      border-radius: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Maximum Block Size: 400px</h1>
  <div class="box">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
  </div>
  <p>In horizontal writing, <code>max-block-size</code> caps height. Content beyond 400px scrolls.</p>
</body>
</html>

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CSS max-block-size Property - 400px Cap with Scrolling