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<!DOCTYPE html>
<style>
body {
margin: 0;
}
.container {
width: 100px;
height: 100px;
background: white;
border: 10px solid black;
overflow: hidden;
}
.shadow-inner {
width: 100%;
height: 100%;
box-shadow: inset 0 0 20px 0px red;
}
</style>
<div class="container">
<div class="shadow-inner"></div>
</div>