HTML Code

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

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

    .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;
      scroll-margin-block-start: 3.5rem;
    }

    .toc a {
      display: block;
      margin: 8px 0;
      color: #2563eb;
      font-weight: 600;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <div class="banner">Fixed site banner</div>
  <main>
    <h1>Docs chapters</h1>
    <nav class="toc">
      <a href="#ch1">Chapter 1</a>
      <a href="#ch2">Chapter 2</a>
      <a href="#ch3">Chapter 3</a>
    </nav>
    <article id="ch1"><h2>Chapter 1</h2><p>Intro content.</p></article>
    <article id="ch2"><h2>Chapter 2</h2><p>Each chapter clears the fixed banner.</p></article>
    <article id="ch3"><h2>Chapter 3</h2><p>More reading below.</p></article>
  </main>
</body>
</html>

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rem units with a fixed top banner