solution full nested css menu ,many tiers or layers

MENU

A CSS vertical menubar with multi levels

menubar

Home
menu-1 >
- menu-1-1
- menu-1-2
menu-2 >
- menu-2-1 >
  - menu-2-1-1
  - menu-2-1-2
- menu-2-2
menu-3 >
- menu-3-1
- menu-3-2