<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
div:before {
box-shadow: -20px 0 20px -20px #001f9c inset;
content: " ";
height: 100%;
left: -20px;
position: absolute;
top: 0;
width: 20px;
}
div:after {
box-shadow: 20px 0 20px -20px #001f9c inset;
content: " ";
height: 100%;
position: absolute;
top: 0;
right: -20px;
width: 20px;
}
div {
background: none repeat scroll 0 0 #f0f1f5;
height: 120px;
margin: 30px;
position: relative;
width: 120px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>