HTML Code

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

    body {
      font-family: system-ui, sans-serif;
      margin: 0;
      background: #f8fafc;
      color: #0f172a;
    }

    .smb-nav {
      position: sticky;
      top: 0;
      padding: 14px 20px;
      background: #0f172a;
      z-index: 1;
    }

    .smb-nav a {
      color: #93c5fd;
      font-weight: 600;
      text-decoration: none;
      margin-right: 16px;
    }

    section {
      min-height: 85vh;
      padding: 24px;
      border-bottom: 1px solid #e2e8f0;
      background: #fff;
    }

  section[id] {
      scroll-margin-block: 4rem 1.5rem;
    }
  </style>
</head>
<body>
  <nav class="smb-nav">
    <a href="#overview">Overview</a>
    <a href="#details">Details</a>
    <a href="#summary">Summary</a>
  </nav>
  <section id="overview">
    <h2>Overview</h2>
    <p><code>scroll-margin-block: 4rem 1.5rem</code> sets block-start and block-end offsets.</p>
  </section>
  <section id="details">
    <h2>Details</h2>
    <p>In horizontal writing mode, block-start is the top and block-end is the bottom.</p>
  </section>
  <section id="summary">
    <h2>Summary</h2>
    <p>Use two values when the top and bottom scroll offsets should differ.</p>
  </section>
</body>
</html>

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Different block-start and block-end offsets