Z-Index

In web development and CSS, the Z-Index property controls the vertical stacking order of elements that overlap. Elements with a higher z-index value are displayed on top of those with a lower value. The z-index only works on positioned elements (those with a position property set to relative, absolute, fixed, or sticky). Proper use of z-index is essential for creating layered designs, modal dialogs, dropdown menus, and ensuring that interactive elements are accessible and display correctly.