//Get the button const btn = document.getElementById("topBtn"); // When the user scrolls down 20px from the top of the document, show the button window.onscroll = function () { scrollFunction() }; function scrollFunction() { if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) { btn.style.display = "block"; } else { btn.style.display = "none"; } } // When the user clicks on the button, scroll to the top of the document function topFunction() { document.body.scrollTop = 0; document.documentElement.scrollTop = 0; }