up-arrow

   function scrollFunction() {
        document.getElementById("myBtn").style.display = "none";
        if (document.body.scrollTop > 1000 || document.documentElement.scrollTop > 1000) {
            document.getElementById("myBtn").style.display = "block";
        }
    }

    // When the user clicks on the button, scroll to the top of the document
    function topFunction() {
        document.body.scrollTop = 0;
        document.documentElement.scrollTop = 0;
    }