text: //Get the button
  //https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_scroll_to_top
  var mybutton = document.getElementById("myBtn");
  
  // 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) {
      mybutton.style.display = "block";
    } else {
      mybutton.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;
  }