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Resize the "Panel" and "Content"
DogHam
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Comments
custom.css in your theme. see documentation on themes.
http://vanillaforums.org/discussion/19915/deploying-a-new-forum-and-adding-a-theme-for-everyone#latest
and this too from whu606
http://vanillaforums.org/addon/annotated_css-theme
and see the wiki.
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.