One last thing before I launch my new website!!!

OK I think I am about ready to go live with my new venture. I first wanted to say thanks to all those who helped me over the last week find answers to my questions. Now I think it’s time to go live with it. I have one last question that I don’t think was ever resolved and it’s a basic cosmetic issue. I was hoping someone could help or just tell me the answer haha.

When a person goes to upgrade they go to this page here for example. There are 2 buttons. Actually here is my site. Just go look at it.

Those 2 buttons in blue, it’s hard to see the text. I think it’s important that I change the text to appear white. What would be the css code for that and what file would I edit?? I can’t seem to figure this out, as simple as it probably is. Thanks