title: Select elements by class using nth-of-type
body: <p>I'm trying to use <code>nth-of-type</code> to set a gray background for every other <code>.time</code> and <code>.title</code> element (odd/even pattern).</p>
  
  <pre><code> &lt;div class="calendar"&gt;
       &lt;div class="time"&gt;Gray Background&lt;/div&gt;
       &lt;div class="title"&gt;Gray Background&lt;/div&gt;
       &lt;div class="time"&gt;White Background&lt;/div&gt;
       &lt;div class="title"&gt;White Background&lt;/div&gt;
       &lt;div class="time"&gt;Gray BG&lt;/div&gt;
       &lt;div class="title"&gt;Gray BG&lt;/div&gt;
       &lt;div class="time"&gt;White Background &lt;/div&gt;
       &lt;div class="title"&gt;White Background&lt;/div&gt;
   &lt;/div&gt;
  </code></pre>