HTML Code

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

    .layout {
      display: flex;
      flex-direction: column;
      gap: 1rem;
    }

    .panel {
      padding: 1rem;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 0.5rem;
    }

    @media (orientation: landscape) {
      .layout {
        flex-direction: row;
      }
      .panel { flex: 1; }
    }
  </style>
</head>
<body>
  <h1>Responsive Layout</h1>
  <div class="layout">
    <div class="panel">Panel A</div>
    <div class="panel">Panel B</div>
  </div>
</body>
</html>

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CSS orientation - Two-Column Layout