[Typo3] RTE - preformattet headers

[Martin Rud]

In the RTE the headers (h1-h6) looks very big, so I would like to style 
them so they reflect the size in the fronend of my page.

However it doesn´t  work when I try using this: 
http://typo3.org/documentation/document-library/doc_core_tsconfig/Introduction-56/

To me it seems that this solution just creates new paragraphs ( i.e. 
<div class="header1">), but I want to work on the way h1-h6 looks in the 
RTE.

Regards, Martin