<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.outside-circle {
width: 100px;
position: relative;
background: #e91e63;
border-radius: 10px 0px 10px 0px;
}
.outside-circle::before {
content: "";
position: absolute;
width: 20px;
height: 20px;
left: 0px;
transform: rotate(180deg);
bottom: -20px;
background: #000;
background: radial-gradient(circle at 0 0, transparent 20px, #e91e63 21px);
}
.outside-circle::after {
content: "";
position: absolute;
width: 20px;
transform: rotate(90deg);
height: 20px;
right: -20px;
top: 0;
background: #000;
background: radial-gradient(circle at 100% 0, transparent 20px, #e91e63 21px);
}
</style>
</head>
<body>
<div>outside-circle</div>
</body>
</html>
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