the way you find these types of things is to right click on the word or area you want to know the css for. from the right click menu choose "inspect element" or whatever your browser calls it. then, a box will open with the source code on one side and the css on the other. it will tell you what css file and what line etc.
now, in the case of links like the Board index text, it is a little more complicated. there is the basic color of the text and then over the top of that is the color of all links on the board. if you change the link color it will change all link colors.... not what you want. IF you change the basic text color it will change the color of all the text that is not links....not what you want.
I would suggest you forget about it. the way it is works great for thousands and thousands of people and is really not worth the trouble to make it a different color.
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OK, so what's the speed of dark?