<!DOCTYPE html>
<html>
<head>
    <style type="text/css" media="screen">
        div#container {
            padding: 15px;
            box-shadow: inset cyan 0 -60px 0 0;
        }
    </style>
</head>
<body>
    <div id="container" style="width:200px;"><div style='width:100px; height:100px; background-color:green'></div></div>
</body>
</html>