HTML Code

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

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

    header, main, footer {
      padding: 24px;
    }

    header {
      background: #0f172a;
      color: #fff;
    }

    main {
      min-height: 180vh;
      background: #f8fafc;
    }

    .sb-top-link {
      position: fixed;
      right: 20px;
      bottom: 20px;
      padding: 12px 16px;
      background: #2563eb;
      color: #fff;
      text-decoration: none;
      border-radius: 999px;
      font-weight: 600;
      box-shadow: 0 8px 20px rgba(37, 99, 235, 0.3);
    }
  </style>
</head>
<body>
  <header id="top">
    <h1>Long article page</h1>
    <p>Scroll down, then use the button to return smoothly.</p>
  </header>
  <main>
    <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Scroll through this content to see smooth scrolling in action when returning to the top.</p>
    <p>Smooth scrolling is especially helpful on documentation pages, landing pages, and single-page layouts with in-page navigation.</p>
  </main>
  <a class="sb-top-link" href="#top">Back to top</a>
</body>
</html>

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Back to top link with smooth scrolling