<!DOCTYPE html>
<html>
<head>
<style>
#main {
width: 300px;
height: 300px;
border: 1px solid black;
display: flex;
}
#main div {
-ms-flex: 1;
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>
</html>