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<!DOCTYPE html>
<html>
<head>
<style> 
#main {
  width: 300px;
  height: 300px;
  border: 1px solid black;
  display: flex;
}
#main div {
  -ms-flex: 1;  /* IE 10 */  
  flex: 1;
}
</style>
</head>
<body>
<h1>The flex Property</h1>
<div id="main">
  <div style="background-color:coral;">RED</div>
  <div style="background-color:lightblue;">BLUE</div>  
  <div style="background-color:lightgreen;">Green div with more content.</div>
</div>
<p><b>Note:</b> IE11 and newer versions support the flex property. Internet Explorer 10 supports an alternative, the -ms-flex property.</p>
</body>
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</html>