<html>
<head>
<style>
#rcorners {
border-radius: 25px;
background: #73AD21;
padding: 20px;
width: 200px;
height: 150px;
}
</style>
</head>
<body>
<p>Add rounded corners for an element with a specified background color:</p>
<div id="rcorners">Rounded corners!</div>
</body>
</html>