HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>em and rem</title>
  <style>
    html {
      font-size: 16px;
    }

    .wrap {
      font-size: 16px;
    }

    p {
      margin: 0 0 8px;
      padding: 0.5rem 0.75rem;
      border-radius: 5px;
      background: rgba(14, 165, 233, 0.15);
      border: 2px solid rgb(14, 165, 233);
      color: #0c4a6e;
      font-family: system-ui, sans-serif;
    }

    .em { font-size: 2em; }
    .rem { font-size: 2rem; }
  </style>
</head>
<body style="margin:0;padding:1.5rem;font-family:system-ui,sans-serif;">
  <div class="wrap">
    <p class="em">2em</p>
    <div class="em">
      <p class="em">2em nested</p>
    </div>
    <p class="rem">2rem</p>
    <div class="rem">
      <p class="rem">2rem nested</p>
    </div>
  </div>
</body>
</html>

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CSS Length — em and rem