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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<div></div>
</body>
</html>
 
div {
  position: relative;
}
div:after {
            position: absolute;
            content: '';
            top: 28px;
            right: 24px;
            width: 32px;
            height: 32px;
            border: 2px solid red;
            border-radius: 50%;
            background: linear-gradient(to top,
            transparent 12px, 
            red 12px,
            red 14px,
            transparent 14px);
            padding: 5px;
        }
* {
  box-sizing: border-box;
}
*:after, *:before {
  box-sizing: border-box;
}
Output 300px

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