Need to Remove Margin Underneath Mega Main Menu

Hello again :slight_smile:

I am using Mega Main Menu on my site,

I need to remove the margin below the menu. Usually I add this css though I have not designed with Mega Main Menu before so I am thinking that perhaps I need to find some css to add for that menu to have no margin? I have also tried to add the css for no top margin in the content of the websites.

What CSS would work best?

Thank you for the help!