So I'm try to make something in C.S.S and i want to make a drop-down kind think and i don't know how to check if an element has a hover property and do something to another element in C.S.S how to do that?

example:

if(element 1 has hover) {
 do something to element 2
}

source:
<http://pastebin.com/EaKimzpP>