z-index - Alphonses ego-riser
Once upon a time, there lived a divider, named Alphonse.
Alphonse was very frustrated, because he was always shadowed by bigger dividers.
On a sunny friday afternoon walks mr. z-index into his office.
He told him a little secret: "You will be always on top, as long you will have biger me as anyone else around you!"
Even when some divider wants to take over all the space, with all the Ultimate mesures ...
... you can allways beat him with setting his z-index to a negative value!
And so with little help of mr. z-index all dividers lived happily ever after.