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 font-size rem Example</title>
  <style>
    html {
      font-size: 100%;
    }

    body {
      font-family: system-ui, sans-serif;
      font-size: 1rem;
      line-height: 1.6;
      padding: 1.5rem;
      color: #334155;
    }

    h1 {
      font-size: 2rem;
      color: #1e293b;
      margin-bottom: 0.5rem;
    }

    h2 {
      font-size: 1.5rem;
      color: #1e293b;
      margin: 1.25rem 0 0.5rem;
    }

    small {
      font-size: 0.875rem;
      color: #64748b;
    }
  </style>
</head>
<body>
  <h1>Page Title (2rem)</h1>
  <h2>Section Heading (1.5rem)</h2>
  <p>Body paragraph at 1rem. <small>Small helper text at 0.875rem.</small></p>
</body>
</html>

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CSS font-size Property - rem Typography Scale