I would like to make the background for sub-menu (dropdowns for second, third, etc. levels) to 100% of the menu Navigation Label text width and I am unsure of where to change this or what I would put into a custom.css file.
See screenshot of menu here:
The submenus seem to inherit the Navigation Label menu background width from the first dropdown level (I think that would be called the second level menu). I have another submenu background that is wider where the Navigation Label text is wider but it still isn't 100%:
So, I think I need to make 2 changes, one to allow the first level submenu background expand to 100%, and also to allow the third or greater levels to expand to 100%, and/or to stop inheriting the width from the level above it.
Hope I explained this right. I'm kinda guessing some of this I'm a bit of a novice at css and theme modification but would appreciate any assistance.