title: Use css nth-child infinitely
body: <p>I need put <code>margin-right:0px</code> each 3 divs.</p>
  
  <p>Actually i use this code but because wordpress are crazy, don't work correct in index.php and archive.php:</p>
  
  <pre><code>.post {position:relative !important;float:left !important;width:207px !important;margin-right:24px;}
  .post:nth-child(4n+0) {margin-right:0px !important;}
  </code></pre>
  
  <p>But only do it in first third div, but not in 6, 9, 12.... Why?</p>
  
  <pre><code>&lt;div class="post"&gt;&lt;/div&gt; */ margin-right:24px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:24px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:0px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:24px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:24px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:0px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:24px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:24px;
  &lt;div class="post"&gt;&lt;/div&gt; */ margin-right:0px;
  </code></pre>
  
  <p>I have 9 post by page, it's possible put in css specified div:first div.second .... with different css?</p>
  
  <p>I can't use nth-child because don't work correctly in my wordpress</p>