title: css styling when click on checkbox
body: <p>I want to style the div#main in the following code when I click on the checkbox inside it. Can I do this using only css/css3? Thank you in advance!</p>
  
  <pre><code>&lt;div id="main"&gt;
  &lt;div id="content"&gt;
  &lt;input type="checkbox"/&gt;
  &lt;/div&gt;
  &lt;/div&gt; 
  </code></pre>