If you are using the latest version on JD New York them you must be aware that it is build on the Astroid Framework and JD Builder.
Therefore the header and footer sections of this template are build with Astroid, so can easily change the background color from Astroid template options >> Layout >> Copyright Section editor >> Design tab >> Change the background color there. (www.screencast.com/t/WDW9u4Dveeg)
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