HTML Code

<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=UTF-8>
  <meta name=viewport content="width=device-width,initial-scale=1">
  <title>Viewport Meta Example</title>
  <style>*{box-sizing:border-box}body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 1rem;font-size:1.25rem;color:#0f172a}.card{padding:1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px;max-width:100%}.card p{margin:0;font-size:.9375rem}.badge{display:inline-block;margin-top:.75rem;padding:.35rem .65rem;background:#dcfce7;color:#166534;border-radius:6px;font-size:.8125rem;font-weight:600}</style>
</head>
<body>
  <h1>Responsive Viewport</h1>
  <div class=card>
    <p>This page uses <code>&lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;</code> so content scales to the device screen width instead of a fixed desktop layout.</p>
    <span class=badge>Mobile-friendly layout</span>
  </div>
  <p>Resize the preview panel or open on a phone to see the difference viewport makes.</p>
</body>
</html>

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HTML meta Tag — Viewport Settings