<!DOCTYPE html>
<html>
<head>
<style>
div {
border: 2px solid #a1a1a1;
padding: 10px 40px;
background: #dddddd;
width: 300px;
border-radius: 25px;
}
</style>
</head>
<body>
<div>The border-radius property allows you to add rounded corners to elements.</div>
</body>
</html>