Featured Pages Background Color CSS class selector

I’m trying to change the Featured Pages Background Color (as found under Customize > Main Content > Featured Pages) through CSS in my child theme, but cannot seem to find the correct class selector for the div container to apply the color change.

When I inspect the element I get the following classes .js-center-images-enabled.fpc-container.fpc-marketing. I have tried applying the color change to all of the classes without success.

Unfortunately I cannot post a link to the site as the site is development in a local environment and not live.

Any help would be appreciated.