HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS width min-width Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      font-size: 1rem;
    }

    @media (min-width: 600px) {
      body {
        font-size: 1.25rem;
      }
    }
  </style>
</head>
<body>
  <h1>Responsive Text</h1>
  <p>Font size grows on viewports 600px wide or wider.</p>
</body>
</html>

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CSS width - min-width Font Size