Changing Color for Dropdown Menu Links

I am building out a site and want to get the links in my menu navigation to be white against a Black background and the colors section doesn't have anything for font color or link color. Here is the URL we're using as I am building a site for a client who wants to keep their current site up and running while this new site is being built: https://mx8.61f.myftpupload.com . You can see that when hovering over the navigation, the dropdown menus appear but they're black with black font. I want white font. I'd also prefer to not have the plus signs there and just have dropdown on hover. Please advise.