Back To Top

 //scroll to top
 (function ($) {
     $.fn.backTop = function () {
         var backBtn = this;

         var position = 1000;
         var speed = 900;

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

             if (pos >= position) {
                 backBtn.fadeIn(speed);
             } else {
                 backBtn.fadeOut(speed);
             }
         });

         backBtn.click(function () {
             $("html, body").animate({ scrollTop: 0 }, 900);
         });
     }
 }(jQuery));

HTML

 <a id="backTop" class="btn btn-back-top bg-teal"></a>

 $(document).ready(function () {
     $('#backTop').backTop();
  });