Css codeing...at least i think thats whats its called!?

Willet's picture
Ok I dont know what its called CSS or something eles but its when you youcange the sceem of a blog or something....I would REALLY like to know how and if some one could explane oooorrrrrr give me a link to somewhere that explanes it well i would GREATLY PRECIATE IT!!

Sorry for spelling cause i know its there im really off today!!