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<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title></title>
<style>
#mask {
clip-path: circle(50%);
width: 100px;
height: 100px;
opacity: 0.5;
}
#content {
width: 100px;
height: 100px;
background-color: green;
}
</style>
</head>
<body>
<div id="mask">
<div id="content"></div>
</div>
</body>
</html>