Can anyone tell me how to create CSS3 menu with Div inside Div tag.

something like this i want-

CNAvbfe.png

I just want to know where can i get a code snipes or where i can learn that type of coding.. so i can implement that part in my menu style.

I tried looking a lot i got some examples but i was unable to extract that code part and was unable to implement that in my code.

My coding aim is to implement big number of menu item in one sub-menu.. like above image.