title: how to support margin-top and margin bottom in CKeditor
body: <p>I am using CKeditor and I want to set margin-top and margin-bottom for many paragraphs in my text but it does not work. These what I have tried till now:</p>
  
  <p>1- use margin top directly inside the editor</p>
  
  <pre><code>&lt;h2 style="margin-top:40px"&gt;What are tokens?&lt;/h2&gt;
  </code></pre>
  
  <p>2- I added a new style to contents.css:</p>
  
  <pre><code>p.ex1 
  {
      margin-top: 100cm;
  }
  </code></pre>
  
  <p>then in the editor I wrote:</p>
  
  <pre><code>&lt;p class="ex1"&gt;What are tokens?&lt;/p&gt;
  </code></pre>
  
  <p>Both ways did not work for, I am using a full toolbar of CKeditor v4.6.2</p>
  
  <p>Any other way to try?</p>