please show us on screenshot how you want to change colors and also please send us link to page where you would like to do these changes so we can give you best possible solution.
So this couldn't be done unfortunately because top bar is one whole and couldn't be split on 2 full width div's without files customization. If you will send us link to page where you would like to do this change, we will show you what else that looks similar is possible.
I work on local i can't send you the link to page, but what I want do the change in the header for all pages if i what do the file modification what i need to do?
We are sorry but if you will have a look on Item Support Policy, you will realize that files customization are not allowed. So if you want to customize theme files and don't know how, you should contact with your web developer.
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please show us on screenshot how you want to change colors and also please send us link to page where you would like to do these changes so we can give you best possible solution.