title: Modify jquery datepicker CSS with beforeShowDay
body: <p>I am using <code>beforeShowDay</code> and have assigned the class <code>specialDay</code> to particular days in my calendar; this works fine, however I am having trouble understanding how to style the class and how the css from theme roller is working in general. I have tried:</p>
  
  <pre><code>td .specialDate {
      background: #33CC66;
  }
  </code></pre>
  
  <p>but this has no affect on the look of the calendar. Any ideas?</p>