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<!DOCTYPE html>
<style>
#wrapper {
position: absolute;
width: 200px;
height: 200px;
border-radius: 50px;
overflow: hidden;
}
#child {
position: absolute;
width: 300px;
height: 300px;
backdrop-filter: invert(100%);
}
</style>
<body>
<div id="wrapper">
<div id="child"></div>
</div>
</body>