How z-index Works
The "z-index" CSS property determines the stacking order of elements on a webpage. It controls the depth or layering of elements along the z-axis, allowing developers to specify which elements appear in front of or behind others. Elements with higher "z-index" values are positioned closer to the viewer, while elements with lower values are positioned further back. This property is particularly useful for creating overlapping effects and controlling the visibility of elements in complex layouts.