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<!DOCTYPE html>
<html>
<body style="background:white">
<style>
div {
position: absolute;
width: 100px;
height: 100px;
border-radius: 30px;
overflow: hidden;
}
span {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: black;
}
</style>
<div><span></span></div>
</body>
</html>