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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.container {
   background-color: red;
   position: relative;
   width: 100%;
   padding-top: 75%; /* 4:3 Aspect Ratio */
}
​
.text {
   position:  absolute;
   top: 0;
   left: 0;
   bottom: 0;
   right: 0;
   text-align: center;
   font-size: 20px;
   color: white;
}
</style>
</head>
<body>
​
<h2>Maintain Aspect Ratio 4:3</h2>
<p>Resize the window to see the effect.</p>
​
<div class="container"> 
 <div class="text">4:3 Aspect ratio</div> 
</div>
​
</body>
​
<!-- Mirrored from www.w3schools.com/howto/tryit.asp?filename=tryhow_css_aspect_ratio_43 by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:38:50 GMT -->
</html>
​
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