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Bartik header disappearing when changing color!

Hi, I do apologize if this is a silly question.

When I change the color and logo of the default theme Bartik to a silver to black (gradient) color it becomes completely white? It also removed the backgrounds of the login area and the navigation area, they are now completely black and have black borders around them. Why is this happening and how do I fix this?

If you take your time to help me with this simple problem, I thank you.

nobody click here