title: Add :hover to decendent
body: <p>How do I add a hover to the following:</p>
  
  <pre><code> table.pvtTable tr th, table.pvtTable tr th
  </code></pre>
  
  <p>I want it added to the final "th" element.</p>
  
  <p>If I do:</p>
  
  <pre><code> table.pvtTable tr th, table.pvtTable tr th:hover
  </code></pre>
  
  <p>everything here is applied by default.</p>
  
  <p>Thanks</p>