<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Rounded corners</title>
    <style>
      html {
        font-family: sans-serif;
      }

      div {
        width: 220px;
        padding: 20px;
        margin: 10px;
        line-height: 2;
        background-color: yellow;
        text-align: center;
        border-style: dashed;
        border-radius: 20px;
      }
    </style>
  </head>
  <body>
    <div>
      <p>Rounded corners are groovy!</p>
    </div>
  </body>
</html>