HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>page scroll-padding-block-start</title>
  <style>
    html {
      scroll-behavior: smooth;
      scroll-padding-block-start: 4rem;
    }

    body {
      font-family: system-ui, sans-serif;
      margin: 0;
      line-height: 1.7;
      color: #334155;
      background: #f8fafc;
    }

    .spbs-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 24px 24px;
    }

    section {
      min-height: 70vh;
      margin-bottom: 24px;
      padding: 24px;
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
    }

    .spbs-toc a {
      display: block;
      margin: 8px 0;
      color: #2563eb;
      font-weight: 600;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <header class="spbs-banner">Fixed site header</header>
  <main>
    <h1>Page with block-start inset</h1>
    <nav class="spbs-toc">
      <a href="#part-1">Part 1</a>
      <a href="#part-2">Part 2</a>
      <a href="#part-3">Part 3</a>
    </nav>
    <section id="part-1"><h2>Part 1</h2><p>Intro content.</p></section>
    <section id="part-2"><h2>Part 2</h2><p>Anchor links land below the fixed header.</p></section>
    <section id="part-3"><h2>Part 3</h2><p>Final section with block-start scrollport inset on <code>html</code>.</p></section>
  </main>
</body>
</html>

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Page top inset for fixed header