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Result Size: 625 x 565
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<!DOCTYPE html>
<html>
<head>
<style>
.test {
  background-color: yellow;
}
</style>
</head>
<body style="height:1500px">
​
<p>Scroll down this page</p>
​
<p id="myP" style="position:fixed">When you have scrolled 50 pixels from the top of this page, add the class "test" (yellow background color) to this paragraph. Scroll up again to remove the class.
</p>
​
<script>
window.onscroll = function() {myFunction()};
​
function myFunction() {
  if (document.body.scrollTop > 50 || document.documentElement.scrollTop > 50) {
    document.getElementById("myP").className = "test";
  } else {
    document.getElementById("myP").className = "";
  }
}
</script>
​
</body>
​
​
​
</html>
​
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