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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>scroll-margin-top rem</title>
  <style>
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: system-ui, sans-serif;
      margin: 0;
      line-height: 1.7;
      color: #334155;
    }

    .sm-banner {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      padding: 12px 20px;
      background: #1e293b;
      color: #fff;
      font-weight: 600;
      z-index: 1;
    }

    main {
      padding: 5rem 20px 20px;
    }

    article {
      max-width: 42rem;
      margin: 0 auto 40vh;
      padding: 24px;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
    }

    article:target {
      outline: 3px solid #2563eb;
      outline-offset: 4px;
    }

    #chapter-2 {
      scroll-margin-top: 3.5rem;
    }

    .sm-toc a {
      display: block;
      margin: 8px 0;
      color: #2563eb;
      font-weight: 600;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <div class="sm-banner">Fixed site banner</div>
  <main>
    <h1>Documentation page</h1>
    <nav class="sm-toc">
      <a href="#chapter-1">Chapter 1</a>
      <a href="#chapter-2">Chapter 2</a>
      <a href="#chapter-3">Chapter 3</a>
    </nav>
    <article id="chapter-1"><h2>Chapter 1</h2><p>Intro content.</p></article>
    <article id="chapter-2"><h2>Chapter 2</h2><p>This chapter uses <code>scroll-margin-top: 3.5rem</code> to clear the fixed banner.</p></article>
    <article id="chapter-3"><h2>Chapter 3</h2><p>More content below.</p></article>
  </main>
</body>
</html>

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scroll-margin-top with rem units