title: if checkbox is checked, do this
body: <p>When I check a checkbox, I want it to turn <code>&lt;p&gt;</code> <code>#0099ff</code>.</p>
  
  <p>When I uncheck the checkbox, I want it to undo that.</p>
  
  <p>Code I have so far:</p>
  
  <pre><code>$('#checkbox').click(function(){
      if ($('#checkbox').attr('checked')) {
          /* NOT SURE WHAT TO DO HERE */
      }
  }) 
  </code></pre>