Rebranding the rest of the WP login form to match new login logo...

Hi
I successfuly changed the wp login logo to our own using your great rebranding plugin.....I would like to change the color of the "login" button AND the "Register | Lost Your Password" text below the box to match.....it's been done here on this site

Would the changes for this be in the css file in Wordpress Admin?

Thanks for your help!
Christina