HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS Length Mixed Example</title>
  <style>
    html {
      font-size: 16px;
    }

    body {
      margin: 0;
      padding: 2rem;
      font-family: system-ui, sans-serif;
      background: #f1f5f9;
    }

    .box {
      width: 50%;
      max-width: 400px;
      height: 200px;
      margin: 2em auto;
      padding: 1rem;
      background-color: #7dd3fc;
      border-radius: 0.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: #0c4a6e;
      font-size: 0.9375rem;
      line-height: 1.5;
    }
  </style>
</head>
<body>
  <div class="box">width: 50% · height: 200px · margin: 2em · padding: 1rem</div>
</body>
</html>

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Mixed Length Units