HTML Code

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

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

    section {
      block-size: 160px;
      padding: 8px;
      border: 1px dashed #64748b;
      background: #f8fafc;
    }

    div {
      block-size: inherit;
      background: #93c5fd;
      border: 1px solid #2563eb;
      padding: 12px;
      box-sizing: border-box;
    }
  </style>
</head>
<body>
  <p>The parent is <strong>160px</strong> on the block axis. The child uses <strong>inherit</strong>, so it copies that size. This property is not inherited unless you ask.</p>
  <section>
    <div>Inherited block size</div>
  </section>
</body>
</html>

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CSS block-size Property — inherit