How to change background color of div


I’m trying to change the background color of #toppanel to ffffff instead of ececec. I found the CSS for it, but now it only shows white in the middle of that bar, not on the sides.

Also, in CSS I am hiding the wordpress nav bar. I’d like the header to move in its place, because now it’s showing a white bar above the black header. If I can change the color of that to black, then that would be an ok alternative, too.

Thanks, Femke