<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
div {
height: 40px;
background: #eee;
border: 4px solid #000000;
border-top-left-radius: 50% 60%;
}
</style>
</head>
<body>
<h2>Border-top-left-radius example.</h2>
<div></div>
</body>
</html>