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<!DOCTYPE HTML>
<style>
#thediv {
width: 400px;
height: 250px;
position: absolute;
top: -500px;
left: -500px;
box-shadow: 540px 540px 10.5px black;
}
#blankdiv {
width: 400px;
height: 250px;
background-color: white;
position: absolute;
top: 40px;
left: 40px;
}
</style>
<div id="thediv"> </div>
<div id="blankdiv"> </div>