Good day, I am pulling in posts and pages from 5 primary

Good day,

I am pulling in posts and pages from 5 primary subtsites as well as a single post type from all other existing sub sites. I am wondering if I could stylize (CSS) each post category differently. For example, all POSTS coming from sub site http://mysite.com/cats would be stylized differently then a particular post type coming from http://mysite.com/dogs.

Can this be easily achieved using network wide posts, post indexer, and custom CSS?

Kindest,

Shane