Apply style from css file

Hi,

I'm trying CKEditor and there's a problem I can't sort out. I should be a standard one but I didn't see any post in the forum about it.
I want that the style box takes styles from classes in my CSS file.

My '.imp' and '.normal' styles are correctly applied in the source code produced by CKEditor but I can't see a preview of the style in the dropdown box nor in the textarea.

Can anybody help me ?


Here is my code :

      $(function() {
         var config = {
         
            extraPlugins : 'autogrow',
            //removePlugins :'elementspath',
            autoGrow_maxHeight : 800,
            stylesSet : [
               // Block-level styles
               { name : '<% = lib_style_title1 %>', element : 'h2', attributes  : { 'class' : '' } },
               { name : '<% = lib_style_important %>', element : 'span', attributes  : { 'class' : 'imp' } },
               { name : '<% = lib_style_normal %>', element : 'span', attributes  : { 'class' : 'normal' } },
            ]
         };

      $('.editor').ckeditor(config);
         
      });