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<!DOCTYPE html>
<style>
#outerDiv {
width: 500px;
height: 500px;
background: lime;
position: absolute;
}
#middleBlur {
width: 300px;
height: 300px;
margin-left: 100px;
margin-top: 100px;
background: black;
box-shadow: inset 0 0 20px 100px lime;
}
</style>
<div id="outerDiv">
<div id="middleBlur">
</div>
</div>