Adjusting my theme

Hey Folks!

So a while ago I had someone design my site for me and now I’m rebranding and changing things. SO I am wanting to change some aspects while keeping other except I cant figure out how he implemented the theme to begin with. I feel like I’m pretty savvy but am feeling really dumb at the moment cause I have scoured the site and can’t even find the CSS or anything! When I go to the theme he used a blank theme but then there’s nothing there to adjust. HELP! Thanks in advance!

http://www.geygurmey.com is where the site is at the moment.