Tryit Editor v3.6

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
  font-family: Arial, Helvetica, sans-serif;
  font-size: 20px;
}

#myBtn {
  display: none;
  position: fixed;
  bottom: 20px;
  right: 30px;
  z-index: 99;
  font-size: 18px;
  border: none;
  outline: none;
  background-color: red;
  color: white;
  cursor: pointer;
  padding: 15px;
  border-radius: 4px;
}

#myBtn:hover {
  background-color: #555;
}
</style>
</head>
<body>

<div style="background-color:black;color:white;padding:30px">Scroll Down</div>
<div style="background-color:lightgrey;padding:30px 30px 2500px">This example demonstrates how to create a "scroll to top" button that becomes visible 
  <strong>when the user starts to scroll the page</strong>.</div>

// 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;
}
</script>

</body>

</html>

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<!DOCTYPE html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><style>body {  font-family: Arial, Helvetica, sans-serif;  font-size: 20px;}​#myBtn {  display: none;  position: fixed;  bottom: 20px;  right: 30px;  z-index: 99;  font-size: 18px;  border: none;  outline: none;  background-color: red;  color: white;  cursor: pointer;  padding: 15px;  border-radius: 4px;}​#myBtn:hover {  background-color: #555;}</style></head><body>​<button onclick="topFunction()" id="myBtn" title="Go to top">Top</button>​<div style="background-color:black;color:white;padding:30px">Scroll Down</div><div style="background-color:lightgrey;padding:30px 30px 2500px">This example demonstrates how to create a "scroll to top" button that becomes visible   <strong>when the user starts to scroll the page</strong>.</div>​<script>//Get the buttonvar mybutton = document.getElementById("myBtn");​// When the user scrolls down 20px from the top of the document, show the buttonwindow.onscroll = function() {scrollFunction()};​

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