HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS height Background Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      margin: 0;
      background-color: #dbeafe;
    }

    @media (min-height: 600px) {
      body { background-color: #dcfce7; }
    }

    @media (max-height: 400px) {
      body { background-color: #fee2e2; }
    }
  </style>
</head>
<body>
  <h1>Resize Browser Height</h1>
  <p>Green when tall (600px+), red when short (400px or less), blue in between.</p>
</body>
</html>

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CSS height - Background by Viewport Height