HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS aspect-ratio 16/9 Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 2rem;
      background-color: #dbeafe;
      margin: 0;
    }

    @media (aspect-ratio: 16/9) {
      body {
        background-color: #bbf7d0;
      }
    }
  </style>
</head>
<body>
  <h1>Resize the Window</h1>
  <p>Background turns green at exactly 16:9.</p>
</body>
</html>

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CSS aspect-ratio - 16/9 Background