<!DOCTYPE html>
<style>
.clip {
width: 100px;
height: 100px;
padding: 20px;
border: 20px solid rgba(0, 0, 0, 0);
border-radius: 70px;
margin: 20px;
background-color: blue;
-webkit-clip-path: fill-box;
}
</style>
<body>
<div class="clip"></div>
</body>