HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scrollTo() — top</title>
</head>
<body>
  <button type="button" id="topBtn">Back to top</button>
  <div style="height:200vh;padding:1rem">
    <p>Scroll down, then click Back to top.</p>
    <p style="margin-top:100vh">You are near the bottom.</p>
  </div>
  <script>
    document.getElementById("topBtn").addEventListener("click", function () {
      window.scrollTo({ top: 0, left: 0, behavior: "smooth" });
    });
  </script>
</body>
</html>

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JavaScript scrollTo() — back to top (Try It)