<script>
        // 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) {
                document.getElementById("myBtn").style.display = "block";
            } else {
                document.getElementById("myBtn").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;
        }
        </script>