<!DOCTYPE html>
<html>
    <head>
        <style>
            #dropshadowDiv {
                margin-bottom: 10px;
                height: 100px;
                width: 100px;
                background: #555;
                filter: drop-shadow(3vmin 5vmin 2vmin black);
                -webkit-filter: drop-shadow(3vmin 5vmin 2vmin black);
            }
        </style>
    </head>
    <body>
		<div id="dropshadowDiv"></div>
    </body>
</html>