title: CSS how to use pseudo-class :not with :nth-child
body: <p>Is is possible to use <code>:not()</code> with  <code>nth-child</code> ? </p>
  
  <p>I tried something like this without any luck :</p>
  
  <pre><code>td:not(:nth-child(4n)){
    text-align:center;
  }
  </code></pre>
  
  <p>However this seems to work :</p>
  
  <pre><code>td:not(:first-child){
    text-align:center;
  }
  </code></pre>
  
  <p>What I am trying is to center align all table columns except 2nd and 4th column. The columns are dynamically generated to add a custom class to these column .</p>