changing global blog styles?

Hi There,
I am trying to change the spirit blog template to reflect the style guide I have but I can't seem to find a global colour or style area in the upfront editor?
Also where do I set global font colours are sizes ? I have set a black 14px body font and yet it seems to be orange when applied to blog post body?
if you could point me i the right direction for tutorials that would be great
thanks
swerve