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<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>