can't get my background set to black on one of my pages

I am running the divi child theme with Photocrati NextGEN version 2.1.15, Photocrati NextGEN Pro version 2.3.5

I have clicked on appearance and customize, all those are set to black…however, when I add a new page, I cannot for the life of me remember what I did when setting up the website with a friend on how to get the background black.

you can visit rastareggaeart.com The two new pages are Custom HeARTwork and Jewelery. Currently it’s white… ?? the other pages *apparel and HeARTwork* are how I want the background to look

Please helP!