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Result Size: 625 x 571
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
#overlay {
  position: fixed;
  display: none;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.5);
  z-index: 2;
  cursor: pointer;
}
</style>
</head>
<body>
​
<div id="overlay" onclick="off()"></div>
​
<div style="padding:20px">
  <h2>Overlay</h2>
  <p>Add an overlay effect to the page content (100% width and height with a black background color with 50% opacity).</p>
  <button onclick="on()">Turn on overlay effect</button>
</div>
​
<script>
function on() {
  document.getElementById("overlay").style.display = "block";
}
​
function off() {
  document.getElementById("overlay").style.display = "none";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/howto/tryit.asp?filename=tryhow_css_overlay by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:38:49 GMT -->
</html>
​
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