A
A
B
B
C
C
Z - Index
The Z - Index allows the layering of objects. For example the objects; A , B, C, each have differing Z - Indexes.
The objects with the lower Z-Index remain in the background in context to the other objects sharing a particular space.

In practice, Web links should have a Z-Index of 0 so that they can be located by the mouse.
The red line has a Z-Index of 0, the Sales Order has been given a Z-Index of -1. Therefore the red line rests "on top" of the Sale Order.
Verity Document
Lennox Computer - 07 3267 7880
info@lennox.com.au
Brisbane, QLD, Australia.
Z-Index (-4)
Waimea, Hawaii
Z-Index (-2)
Z-Index (-1)
Z-Index (0)