HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>orientation: portrait</title>
  <style>
    .box {
      padding: 1rem;
      background: #e2e8f0;
      font-weight: 700;
    }

    @media (orientation: portrait) {
      .box {
        background: #dbeafe;
      }
    }
  </style>
</head>
<body>
  <div class="box">Portrait styles when tall.</div>
</body>
</html>

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CSS orientation Media Feature — portrait