So you want to have custom colors in the header for each Divi page?  this is definitely possible, and is all related the to unique page ID in WordPress.  you find the unique page ID in the address bar when editing a page in WP admin. Rather than make my own blog about this, you can find out how at the blog link below (as well as info about adding icons to the menu items and making an interactive logo (transitioning from one image to another) – all using just Divi and some CSS.

These header modifications are very sexy


Divi WordPress Theme