examples/css/rounded-corners.html
<html>
<head>
<title>Rounded corners</title>

<style>
#pw {
/*
  background-color: #004065;
  color: #FFF;
  font-size: 40px;
  font-weight: bold;

          border-radius: 15px;
     -moz-border-radius: 15px;
  -webkit-border-radius: 15px;

  border: 1px solid #000;
  padding: 10px;
  text-decoration: none;

*/
}
</style>
</head>
<body>
<a id="pw" href="http://perlweekly.com/">Perl Weekly Newsletter</a>
</body>
</html>

http://css-tricks.com/snippets/css/rounded-corners/