looking for css style color

Does anyone know the exact line in the css style sheet for the background of the buttons?

Take a look at the attached pic. I want to match my button background with the background of my logo. So I guess I need to know where the logo background is also.

I used the gui interface to edit these colors but they did not seem to change, and because the greys are so similar, the example colors all looked the same. So if I can go into css style sheet and edit both of these colors to be the same I think that would be ideal.

Thanks in advance