JSFiddle - React, Tailwind, and code Playground

HTML

<div id="backToTop">Top!</div>

CSS

html { height: 2000px; } /* create a scrollbar for demo purposes */

#backToTop {
    position: fixed;
    top: 200px;
    right: 50px;
    display: none;
}

JavaScript

$(window).scroll(function(){
   if( $(document).scrollTop() > 0 ) {
      $('#backToTop').show();
   } else {
      $('#backToTop').hide();
   }
});