Some style creators also have you install a plugin which then inserts their own stylevars to be used, I cannot remember off the top of my head if talktemplate does this... if so the stylevar to change could be within those stylevars.
Normally to change font style/size etc for the entire board you would change the font stylevar:
AdminCP > Styles & Templates > Style Manager > Style Variable Editor > *Scroll to find the Global family of stylevars, now look for the stylevar font and edit accordingly.
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