title: Scroll to top link for website using pure JAVASCRIPT without(jquery)
body: <p>I want normal scroll to top for website. </p>
  
  <p>The scroll to top link appears at the bottom of page(near footer) which only visible after 200px mouse scroll down and should be hidden when scroll back to top. WITHOUT <code>JQUERY</code></p>
  
  <p>Here is the <a href="https://codepen.io/sturobson/pen/equnb" rel="noreferrer">demo</a></p>
  
  <p>In this demo back to top is already at the bottom. Is there any way to show back to top link fixed as I mention above?</p>