HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Styled summary</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}details{max-width:420px;padding:.75rem 1rem;background:#fff;border:1px solid #e2e8f0;border-radius:8px}summary.highlight{cursor:pointer;font-weight:600;color:#dc2626}details p{margin:.75rem 0 0;color:#475569}</style>

</head>

<body>

  <details>

    <summary class=highlight>Your Styled Summary</summary>

    <p>This is the hidden content that appears when you click the summary.</p>

  </details>

</body>

</html>

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HTML summary Tag — Styled with class