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<!DOCTYPE html>
<html>
<title>CSS Borders: border-shape with inset box-shadow reference</title>
<style>
body {
margin: 0;
padding: 50px;
}
#target {
width: 100px;
height: 100px;
background: green;
/* Use border-radius as the canonical circle reference */
border-radius: 50px;
box-shadow: inset 0 0 10px 0 black;
}
</style>
<body>
<div id="target"></div>
</body>
</html>