Need help centering Cat menu bar & coordinating background color & dashed border

I am trying to center my category menu bar, and that works fine.

However, I can not seem to get the background color to match the color of the menu bar and I can not get the dashes to go away or change their color.

I have looked at the threads in here, but they are not working (maybe because I am running the new Atahualpa version)...