Unstacking CSS Stacking Contexts– Smashing Publication
In CSS, we can develop” stacking contexts”where elements are aesthetically placed one on top of the next in a three-dimensional sense that produces the perception of depth. Stacking contexts are extremely helpful, but they’re likewise widely misconstrued and often mistakenly created, leading to a variety of layout problems that can be tricky to solve. Source

In CSS, we can develop” stacking contexts”where elements are aesthetically placed one on top of the next in a three-dimensional sense that produces the perception of depth. Stacking contexts are extremely helpful, but they’re likewise widely misconstrued and often mistakenly created, leading to a variety of layout problems that can be tricky to solve.
Source
