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<!DOCTYPE html>
<meta charset="utf-8">
<title>Filled Background with Rounded Corner</title>
<style>
#a {
width: 100px;
height: 80px;
border: 20px blue solid;
border-top-right-radius: 20px;
background-color: green;
background-clip: border-box;
}
#shield {
position: absolute;
width: 30px;
height: 30px;
left: 120px;
top: 5px;
background-color: black;
}
</style>
<body>
<div id="a"></div>
<!-- Hide the curved outside border to deal with imprecise rendering. -->
<div id="shield"></div>
</body>