hello , i have inserted your code in style.css of my them but not change the problem.
If can help you , the problem on the menu not is for gmap in home because i have inserted it a couple days ago and the problem is old .
The problem have on primary menu and on top menu of http://www.latina.biz
you can test the problem on TOP menu with “GRUPPI FB” ,have a submenu and have transparence , not can click all the link on submenu .
Await your news