HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS screen orientation Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1rem;
      margin: 0;
    }

    .layout {
      display: grid;
      gap: 0.75rem;
    }

    .box {
      padding: 1rem;
      background: #dbeafe;
      border-radius: 0.5rem;
      text-align: center;
    }

    @media screen and (orientation: landscape) {
      .layout {
        grid-template-columns: 1fr 1fr;
      }

      .box {
        background: #bbf7d0;
      }
    }
  </style>
</head>
<body>
  <h1>Orientation Demo</h1>
  <div class="layout">
    <div class="box">Box A</div>
    <div class="box">Box B</div>
  </div>
</body>
</html>

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CSS screen - Landscape Orientation