Changing the color of a PORTION of the footer - debut theme!

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Hi there,

I have been trying to find the right tag to change the bottom half of my site footer to be black. I am almost there but am running into an issue since the tag is connected to both the top and bottom parts of the footer. I was able to get the links/copyright to have the black background but I would ideally want the whole portion below the white footer border to be in this style. 

site url:

pw: urbnsage2021

Any help would be appreciated! I have all the code just need the tag name that would encompass this area. Right now its just padding and margin and if I change it for the area I want, it changes everything.

Thank you!!