<!DOCTYPE HTML>
<html><head>
<style>
#s {
position: absolute;
top: 20px;
left: 20px;
display: block;
width: 400px;
height: 150px;
box-shadow: 0px 250px black;
}
</style>
</head>
<body>
<input type="file" id="s" />
</body>
</html>
