Change Site Title colour

Hi, I am using the Church Theme which is a child of Omega. What I want to do is to be able to change the size and colour of the Site Title and Tagline without affecting anything else. I have worked out how to change the tagline colour but that also changes my menu background which I don’t want.

Is it possible to change just the Site Title and also the tagline only and if so how/where do I change it.

However I am most interested in the Site Title