<!DOCTYPE html>
<html>
<head>
<style>
#borderradiusDiv{
margin-bottom: 10px;
height: 100px;
width: 100px;
background: #555;
border-radius: 5vw;
box-shadow: inset -2vh 2vw 0 orange;
}
</style>
</head>
<body>
<div id="borderradiusDiv"></div>
</body>
</html>