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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<style>
.outer {
position: absolute;
width: 200px;
height: 150px;
overflow: hidden;
}
.inner {
position: absolute;
top: 3px;
left: 3px;
width: 200px;
height: 150px;
box-shadow: blue 0px 0px 20px inset;
}
</style>
<div class="outer">
<div class="inner"></div>
</div>