You can change the background color and image of the Footer Widgets Area with Zakra.

Just follow the steps shown below:

From your WordPress Dashboard, go to Appearance > Customize > Footer > Footer Widgets section.
Under the Background options, choose the Background Color or Background Image for the Footer Widgets Area.
Click on Publish.

It is shown in the images below:

Background Color

Background Image

To set different backgrounds for the footer of different pages, i.e., available in Pro only. Refer to this article: How to change the background of the Footer Widgets of an individual page (Pro)
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