Difference between auto, 0, and no z-index?

Question

What is the difference between:

1. z-index: auto
2. z-index: 0
3. no z-index at all

All the above sc

Answer 1

n CSS, you can position 2 or more objects to overlap each other. Their z-indexes determine which objects are "in front of" or "behind" other objects that they overlap. The higher an object's z-index, the "higher in the stack" of objects it will display