Creating a tooltip triangle on top of Sub Menu

Hi,

first of all thank you for the plugin, it’s doing an amazing job.

I have a question if it’s possible to add a white triangle on top of the submenu, like you see with tooltips usually.

I have added an example of this in the URL field. I have already googled and tried many different CSS, but it seems difficult to add this with the way of how the css of the submenu is structured.

Can anyone help me out on this one?

Thank you a lot.

The page I need help with: [log in to see the link]