WooStore: Changing colors of navigation banner

Hello,

I’ve recently been helping a business update it’s web appearance and have had some trouble trying to edit some of the colors on the main page. I can not figure out how to update the colors on the navigation banner at the top of the page. I know it’s not editable in the normal theme editor, as I’ve searched that endlessly. I have a general understanding of basic HTML/CSS, and can usually figure out a simple things like changing the color. Currently the banner is a ghastly mix of colors and I can’t figure out where in the code the markup is located.

If anyone has any suggestions on how to fix this problem it would be much appreciated.

Here’s the site: https://felicitysweets.com