HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>CSS font-size Instead of big</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}p{margin:0 0 .75rem;line-height:1.7;font-size:.95rem;max-width:520px}.large-text{font-size:1.25rem;font-weight:600;color:#0f172a}.tip{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:8px;padding:.75rem 1rem;font-size:.875rem;color:#166534;max-width:420px}</style>

</head>

<body>

  <h1>CSS Instead of &lt;big&gt;</h1>

  <p>

    In this example, we emphasize the

    <span class=large-text>key features</span>

    of our product using CSS.

  </p>

  <p class=tip>Use <code>font-size</code> with <code>rem</code> units for accessible, scalable text.</p>

</body>

</html>

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Modern Replacement — CSS font-size