<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
  <title>Three paragraphs lime background middle unstyled</title>
  <style type="text/css">
    p { margin: 0 0 1em 0; }
    .lime { background-color: lime }
  </style>
 </head>
 <body>
   <p class="lime">This paragraph should have a green background.</p>
   <p>This paragraph should be unstyled.</p>
   <p class="lime">This paragraph should have a green background.</p>
 </body>
</html>