I am not sure if I am doing something wrong, I wanted my Main Menu to have a white background #ffffff. It appears white on the home page, but when I go to a post page, the Main Menu still has a black background.
In this case, you need to setup the Bottom Bar Background Color option. You can find the option on the Customize > JNews Header Option > Header Desktop Option > Desktop Header – Bottom Bar > Bottom Bar Background Color. Let me know if you have further question.