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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="4/w3.css">
<body>
​
<div class="w3-overlay w3-show"></div>
​
<div class="w3-container">
  <h2>Overlay</h2>
  <p>The w3-overlay class adds an overlay to the page content (100% width and height with a black background color with 50% opacity).</p>
  <p>Note that the overlay class is hidden by default. Use w3-show to use it. The overlay effect is often used when opening sidebars, to "hide" the page content.</p>
</div>
​
</body>
​
<!-- Mirrored from www.w3schools.com/w3css/tryit.asp?filename=tryw3css_ref_overlay by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:12:31 GMT -->
</html> 
​
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