HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

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

  <title>Styled Legend Example</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 1rem;font-size:1.25rem;color:#0f172a}.form-section{border:1px solid #93c5fd;border-radius:8px;padding:1rem 1.25rem;max-width:360px;background:#f0f9ff}.form-section__title{font-weight:600;font-size:.9375rem;color:#1e40af;padding:0 .35rem}label{display:block;margin:.65rem 0 .25rem;font-size:.8125rem;font-weight:500;color:#475569}label:first-of-type{margin-top:.25rem}input{width:100%;box-sizing:border-box;padding:.45rem .6rem;border:1px solid #cbd5e1;border-radius:6px;font-size:.875rem;background:#fff}</style>

</head>

<body>

  <h1>Account Details</h1>

  <fieldset class=form-section>

    <legend class=form-section__title>Account Details</legend>

    <label for=username>Username:</label>

    <input id=username name=username autocomplete=username>

    <label for=password>Password:</label>

    <input type=password id=password name=password autocomplete=new-password>

  </fieldset>

</body>

</html>

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HTML legend Tag — Styled Legend