HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>media — responsive query</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}.box{padding:1.25rem;border-radius:8px;font-weight:600;max-width:420px}.hint{margin-top:1rem;font-size:.8125rem;color:#64748b;max-width:420px}</style>

  <style media=(max-width:599px)>.box{background:#fecaca;color:#991b1b;border:2px solid #f87171}</style>

  <style media=(min-width:600px)>.box{background:#bbf7d0;color:#166534;border:2px solid #4ade80}</style>

</head>

<body>

  <h1>media query on &lt;style&gt;</h1>

  <div class=box id=status>Resize the window to switch styles</div>

  <p class=hint>Below 600px width: red mobile box. At 600px and above: green desktop box. Each rule lives in a separate <code>&lt;style media="..."&gt;</code> block.</p>

  <script>function updateLabel(){var t=document.getElementById("status");window.matchMedia("(max-width: 599px)").matches?t.textContent="Mobile styles active (max-width: 599px)":t.textContent="Desktop styles active (min-width: 600px)"}updateLabel(),window.addEventListener("resize",updateLabel)</script>

</body>

</html>

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HTML media Attribute — Responsive Stylesheet Conditions