Scroll up button

How to hide the scroll up button and make it visible when we reach the bottom of the page.

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_scroll_to_top

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Try to Google before posting your queries here.
This is the code block which will hide the button until we reach bottom of the page.

mybutton = document.getElementById("myBtn");
window.onscroll = function () { scrollFunction() };
function scrollFunction() {
  if ((window.innerHeight + window.scrollY) 
     >= document.body.offsetHeight) {
        mybutton.style.display = "block";
  } else {
        mybutton.style.display = "none";
  }
}
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