@Jake B. got the issue resolved on the backstretch. Thing is, it worked fine before the update, so I don't know if that background color was applied in the update, or was something that I had set that did not cause an issue before the update.
I always clear any cache (redis/memcached) and restart the PHP processor and server just to make sure that it's not a cache issue before really complaining as I have had issues with cache causing DB updates not to take effect in the past (not just with UI.X but other add-ons also).
I've even gone so far as to revert the system from 7.0.3 of PHP to 5.6 series to trouble shoot before reporting something.
@i9hdkill - you may want to check and see if this is your issue also.