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Oh wait, you did. However, I am using the Old Cheese theme which seems to take priority over your changes there. Add an Important! to the background in those places?
It works fine on the green field theme you are using, but I believe you are the only active using it. Might need to test your post layout on other themes.
I've been meaning to use Circuit, actually. I went around to a few themes, and there was one that I couldn't fix .topbar1966_1 on, with the border not existing, but otherwise my layout seems to work pretty well on some popular themes.