Latest blogs module width in article

Hi there,

I am using the Kallyas theme on my Joomla 2.5.
This theme allow to embed modules in articles through shortcodes.
I would like to include the latest blogs module in my homepage, unfortunately, its width is not set, so the module takes the entire width of the content part of the page.
I would like to set its width to something like 600px.
I tried to set it throught the html in the article, inside a span, as this module should be next to another one (so a div or p is not what I'm looking for). No way.

Is you have any solution, just let me know... It would help me to not destroy my homepage...

Thanks a lot for your help and answers.