Hello Jason,
Thanks for writing to us.
To change the submenu background colour you need to replace with this custom CSS code in X/Pro-->Theme Option --->CSS
.x-navbar .sub-menu {
background-color: #151515;
}
The CSS code that you are using, It would change the background colour of Navbar and submenu background colour as well. The code is coming from the Theme option settings you can change the colour of Navbar background in case if you have set “Stack” as “Renew”, “Icon” and “Ethos”
Screenshot
You can not change the code but you can override the CSS code.
The purpose of providing the custom CSS to show you how to add CSS code to your site. Writing custom CSS is outside the scope of our theme support. If you need more customization, you need to learn CSS and learn how to use the browser’s element inspector.
Hope it helps you.
Thanks