Add Go to Top Button with CSS & Jquery for Blogger

Use the Following code and Put it before </body> tag on your Template and Save.

<style type="text/css">
#w2b-StoTop {-moz-border-radius: 5px;-webkit-border-radius: 5px;border-radius: 5px; width:100px;background-color: #EEEEEE;background-color: rgba(238, 238, 238, 0.6);filter: progid:DXImageTransform.Microsoft.gradient(startColorStr='#99EEEEEE',EndColorStr='#99EEEEEE');text-align:center;padding:5px;position:fixed;bottom:10px;right:10px;cursor:pointer;color:#444;text-decoration:none;border:1px solid #C9C9C9;}
</style>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
<script type='text/javascript'>
$(function() {
    $.fn.scrollToTop = function() {
 $(this).hide().removeAttr("href");
 if ($(window).scrollTop() != "0") {
     $(this).fadeIn("slow")
 }
 var scrollDiv = $(this);
 $(window).scroll(function() {
     if ($(window).scrollTop() == "0") {
  $(scrollDiv).fadeOut("slow")
     } else {
  $(scrollDiv).fadeIn("slow")
     }
 });
 $(this).click(function() {
     $("html, body").animate({
  scrollTop: 0
     }, "slow")
 })
    }
});
$(function() {
    $("#w2b-StoTop").scrollToTop();
});
</script>
<a href='#' id='w2b-StoTop' style='display:none;'>Back to Top </a>

You can Customize the CSS for Your Own Declarations and you can replace the text with Image also.
You Are Done!