<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Selectivizr example</title>
     
    <style>

    p:first-child {
      background: red;
      color: white;
      font-size: 3em;
      text-align: center;
    }

    </style>
    
  </head>
  <body>
    <p>Selectivizr example</p>

    <p>Selectivizr example</p>
  </body>
</html>