Add Scroll Up ( Top Up) Button into Blogger

Go to Blog Click Layout > Add a gadget > HTML/JavaScript then copy following Code and Past Here



<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css" />
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.2/css/all.css" integrity="sha384-oS3vJWv+0UjzBfQzYUhtDYW+Pj2yciDJxpsK1OYPAYjqT085Qq/1cq5FLXAZQ7Ay" crossorigin="anonymous" />

<style>


#myBtn {
  display: none;
  position: fixed;
  bottom: 100px;
  right: 30px;
  z-index: 99;
  color:darkblue;
  border: none;
  outline: none;

  
  cursor: pointer;

}

#myBtn:hover {

    color:red;
 box-shadow: inset 0 0 0 3px #3a7999;
    border-radius: 100%;
   
   
}
</style>



<i class="w3-xxlarge fas fa-arrow-circle-up" onclick="topFunction()" id="myBtn" title="Go to top"></i>



<script>
// When the user scrolls down 20px from the top of the document, show the button
window.onscroll = function() {scrollFunction()};


function scrollFunction() {
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    document.getElementById("myBtn").style.display = "block";
  } else {
    document.getElementById("myBtn").style.display = "none";
  }
}

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