<!DOCTYPE html>
<html>
    <head>
        <style>
            #borderradiusDiv{
                margin-bottom: 10px;
                height: 100px;
                width: 100px;
                background: #555;
            }
        </style>
    </head>
    <body>        
		<div id="borderradiusDiv"></div>
    </body>
</html>