HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS block-size Fixed Size</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }
    .box {
      block-size: 200px;
      background-color: lightblue;
      padding: 1rem;
      border-radius: 0.75rem;
    }
  </style>
</head>
<body>
  <h1>Block Size: 200px</h1>
  <div class="box">This box has a block size of 200px.</div>
  <p>In horizontal writing, <code>block-size</code> controls height.</p>
</body>
</html>

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CSS block-size Property - Fixed Pixel Size