https://bestcoachingever.com/admin/js/smoothscroll.js

1$(document).ready(function(){
2  // Add smooth scrolling to all links
3  $("a").on('click', function(event) {
4
5    // Make sure this.hash has a value before overriding default behavior
6    if (this.hash !== "") {
7      // Prevent default anchor click behavior
8      event.preventDefault();
9
10      // Store hash
11      var hash = this.hash;
12
13      // Using jQuery's animate() method to add smooth page scroll
14      // The optional number (800) specifies the number of milliseconds it takes to scroll to the specified area
15      $('html, body').animate({
16        scrollTop: $(hash).offset().top
17      }, 800, function(){
18   
19        // Add hash (#) to URL when done scrolling (default click behavior)
20        window.location.hash = hash;
21      });
22    } // End if
23  });
24});
25
26
27
28// When the user scrolls down 20px from the top of the document, show the button
29window.onscroll = function() {scrollFunction()};
30
31function scrollFunction() {
32    if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
33        document.getElementById("topbtn").style.display = "block";
34    } else {
35        document.getElementById("topbtn").style.display = "none";
36    }
37}
38
39// When the user clicks on the button, scroll to the top of the document
40function topFunction() {
41
42	$("html, body").animate({ scrollTop: 0 }, 600); 
43	return false; 
44	//document.body.scrollTop = 0; // For Chrome, Safari and Opera 
45	// document.documentElement.scrollTop = 0; // For IE and Firefox
46}