Change Colours via CSS

Hello 🙂

I want to change the colours of the navigation via css but really cant figure out which codes to change each section. Please see the below pictures which shows what I want to do.

Would be nice if someone could help. Many thanks

http://s15.postimg.org/cls904sl7/Need_your_help_please.jpg

[url=http://postimg.org/image/k1rilxgaf/][img]http://s15.postimg.org/k1rilxgaf/Need_your_help_please.jpg[/img][/url]

Kind regards

Tim

https://wordpress.org/plugins/shiftnav-responsive-mobile-menu/