OneExperienceKB/Assets/js/oneexperiencekb.js

$(window).scroll(function() {
  var height = $(window).scrollTop();

  if (height > 200) {
    $('#backToTop').fadeIn();
  }
  else {
    $('#backToTop').fadeOut();
  }
});

$(document).ready(function() {
  $("#backToTop").click(function(event) {
    event.preventDefault();
    $("html, body").animate({ scrollTop: 0 }, "slow");
    return false;
  });
});