Q : What is the purpose of the z-index and how is it used?

Answer:

The z-index helps to specify the stack order of positioned elements that may overlap one another. The z-index default value is zero and can take on either a positive or negative number.

An element with a higher z-index is always stacked above than a lower index.

z-index can take the following values:

• Auto: Sets the stack order equal to its parents.


• Number: Orders the stack order.


• Initial: Sets this property to its default value (0).


• Inherit: Inherits this property from its parent element.