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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>
​
<!-- Sidebar -->
<div class="w3-sidebar w3-bar-block w3-animate-left" style="display:none;z-index:5" id="mySidebar">
  <button class="w3-bar-item w3-button w3-large" onclick="w3_close()">Close &times;</button>
  <a href="#" class="w3-bar-item w3-button">Link 1</a>
  <a href="#" class="w3-bar-item w3-button">Link 2</a>
  <a href="#" class="w3-bar-item w3-button">Link 3</a>
</div>
​
<!-- Page Content -->
<div class="w3-overlay w3-animate-opacity" onclick="w3_close()" style="cursor:pointer" id="myOverlay"></div>
​
<div>
  <button class="w3-button w3-white w3-xxlarge" onclick="w3_open()">&#9776;</button>
  <div class="w3-container">
    <h1>Sidebar Overlay</h1>
    <p>The w3-overlay class can be used to create an overlay effect, when opening the sidebar. The w3-overlay class adds a black background with a 50% opacity to the "page content" - this effect will "highlight" the side navigation</p>
    <p>Click on the "hamburger menu" to see the effect.</p>
  </div>
</div>
     
<script>
function w3_open() {
  document.getElementById("mySidebar").style.display = "block";
  document.getElementById("myOverlay").style.display = "block";
}
​
function w3_close() {
  document.getElementById("mySidebar").style.display = "none";
  document.getElementById("myOverlay").style.display = "none";
}
</script>
          
</body>
​
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