HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS max-aspect-ratio Portrait Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      margin: 0;
    }

    .grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
      max-width: 28rem;
    }

    .grid div {
      padding: 1rem;
      border-radius: 0.4rem;
      background: #dbeafe;
    }

    @media (max-aspect-ratio: 1/1) {
      .grid {
        grid-template-columns: 1fr;
      }
    }
  </style>
</head>
<body>
  <h1>Portrait Layout</h1>
  <p>Resize to a tall window to stack columns.</p>
  <div class="grid">
    <div>Column 1</div>
    <div>Column 2</div>
  </div>
</body>
</html>

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CSS aspect-ratio - Portrait Grid Stack