drop down menu hidden behind menu

Hi all,

I was testing my mobile menus, and the submenus of my menu “programa Oeiras Solidaria” are showing hidden the other menu below. I tried with z-index, and couldnt solve it. I dont know if its my css path that is incorrect or other thing. I am new to CSS.

link to my site : http://oeirassolidaria01.cloudaccess.host/

i am stuck here for long time :frowning:

Thks in advance