I am lost here. I cannot figure out where to change the border/background color of the admin/client main table area. Its not in the admin > theme config area either (using text theme)

Using a firefox web dev tool, I see that the background color of the table area is f9f9f9 and border is c0c0c0 (thats a zero, not letter O)

These two colors are nowhere found in admin theme area nor stylesheet.css

Where is this found?

Also, can the font size be in em format? I want the "small" to be between 1 and 2, somewhere around 1.5pt equivalent (whatever that would be in em format).

Using modernbill v4