HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>scrollBy() — smooth</title>
</head>
<body>
  <button type="button" id="nextBtn">Next section</button>
  <section style="height:100vh;padding:1rem;background:#eef">Section 1</section>
  <section style="height:100vh;padding:1rem;background:#efe">Section 2</section>
  <section style="height:100vh;padding:1rem;background:#fee">Section 3</section>
  <script>
    document.getElementById("nextBtn").addEventListener("click", function () {
      window.scrollBy({ top: window.innerHeight, behavior: "smooth" });
    });
  </script>
</body>
</html>

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