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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">
<style type="text/css">
.w3-bar-item ,.w3-button,.w3-bar-block{
    background-color:black;
    color:white;
}
body{background-color:black;}
.w3-teal,.main{
    background-color:black;
    color:red;
}
</style>
</head>
<body>
    <div class="w3-sidebar w3-bar-block w3-card w3-animate-left" style="display:none" 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>
<div id="main">
<div class="w3-teal">
  <button id="openNav" class="w3-button w3-teal w3-xlarge" onclick="w3_open()">&#9776;</button> <center><h1>My Page</h1></center>
  
</div>



<script>
function w3_open() {
  document.getElementById("main").style.marginLeft = "25%";
  document.getElementById("mySidebar").style.width = "25%";
  document.getElementById("mySidebar").style.display = "block";
  document.getElementById("openNav").style.display = 'none';
}
function w3_close() {
  document.getElementById("main").style.marginLeft = "0%";
  document.getElementById("mySidebar").style.display = "none";
  document.getElementById("openNav").style.display = "inline-block";
}
</script>


</body>
</html>
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