This is AP Div One
AP DIV Page One - align top left
AP DIV Page Two - align top center
AP DIV Page Three - align center center
AP DIV Page Four - z levels
This is AP Div Two
This is AP Div Three
This page is centered horizontally and vertically and has AP Divs
The vertical container makes it centered up and down. It has
Left: 0px -- the width is 100% - so it stretches from side to side.
Top: 50% -- this means it is in the middle - the top of the DIV start exactly in the middle if the window.
The container has a height of 600px
We add a margin-top: -300px - or half of the container height - which means it starts that much above the center point of the page.