Check it out CSS

So I fixed the color of the web page but now I am having trouble with formatting, like I can't seem to prevent some links from being a list and I don't know if the problem is with my CSS or something else. I also want to fill in some of the white spaces with color. For the most part I am fine with the color but I think I could work on it a bit. Anyway, like I said, if I could fix the formatting it would look much better.