HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS height Compact Header</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      margin: 0;
    }

    .site-header {
      padding: 1.25rem 1.5rem;
      background: #fff;
      border-bottom: 1px solid #e2e8f0;
      font-size: 1.125rem;
      font-weight: 600;
    }

    main { padding: 1.5rem; }

    @media (max-height: 500px) {
      .site-header {
        padding: 0.5rem 1rem;
        font-size: 0.9375rem;
      }
    }
  </style>
</head>
<body>
  <header class="site-header">Site Header</header>
  <main>
    <p>Resize the window shorter to see the compact header.</p>
  </main>
</body>
</html>

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CSS height - Compact Header