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<!DOCTYPE html>
<html>
<head>
<style>
#div1 {
  position: absolute;
  left: 50px;
  width: calc(100% - 100px);
  border: 1px solid black;
  background-color: yellow;
  padding: 5px;
  text-align: center;
}
</style>
</head>
<body>
​
<h1>The calc() Function</h1>
​
<p>Create a div that stretches across the window, with a 50px gap between both sides of the div and the edges of the window:</p>
​
<div id="div1">Some text...</div>
​
</body>
​
<!-- Mirrored from www.w3schools.com/cssref/tryit.asp?filename=trycss_func_calc by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 03:12:54 GMT -->
</html>
​
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