CSS Property: z-index
The placement of a positioned box in the z-axis.

Possible Values
| Value | Note | Example |
|---|---|---|
| [integer] | The higher the number, the higher the box will be in the stack (the “closer” it will be to the user as they look at the display). | 3 |
auto | Default. | |
inherit | ||
initial | ||
unset | ||
Example
div { position: absolute; }
#kidkoala { z-index: 2 }
#mrscruff { z-index: 1 }
