HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS min-aspect-ratio Hero Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      margin: 0;
    }

    .hero {
      padding: 2rem 1.5rem;
      background: #334155;
      color: #fff;
      text-align: center;
    }

    .hero h1 {
      margin: 0;
      font-size: 1.75rem;
    }

    @media (min-aspect-ratio: 16/9) {
      .hero {
        padding: 4rem 2rem;
        background: linear-gradient(135deg, #1e3a8a, #2563eb);
      }
      .hero h1 {
        font-size: 2.5rem;
      }
    }
  </style>
</head>
<body>
  <section class="hero">
    <h1>Welcome</h1>
    <p>Resize to widescreen for the cinematic hero.</p>
  </section>
</body>
</html>

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CSS aspect-ratio - Widescreen Hero