How can i increase the size of the fonts in the drop down sub menu

Hi
I have set the fonts at 17px in the enfold settings but they are still displaying very small in the submenu drop downs on the main menu homepage? how can i increase these?

Also when I add a colour section onto the homepage in say a cream colour under a white section I am still seeing a dark border at the bottom of the colour section even though I have set the settings in that colour section to ”no border”

Thanks

James