<!DOCTYPE html>
<html>
<head>
<style>
.box {
position: absolute;
top: 50px;
left: 50px;
height: 100px;
width: 100px;
background-color: silver;
box-shadow: 0 0 20px black;
}
</style>
</head>
<body>
<div class="box"></div>
</body>
</html>