The problem is, that the box-shadow and background effect I don’t want to be applied on the child elements (aka: the drop down menu). As you can see it current is applied. I’ve tired this syntax, but no luck:
I cant get to the CSS on your page… and this far less graceful a solution but…
#menu-main-navigation li li a:hover{… set box-shadow effects to none and border-radius:0}
and that should do it, also look at the order of your code, it may not just be a more specific rule , but a similar rule that comes later in the code that re-introduces the drop shadow…