The CSS z-index property can be used in conjugation with the position property to create an effect of layers like Photoshop.
Stacking Elements in Layers Using z-index Property
Usually HTML pages are considered two-dimensional, because text, images and other elements are arranged on the page without overlapping. However, in addition to their horizontal and vertical positions, boxes can be stacked along the z-axis as well i.e. one on top of the other by using the CSS z-index property. This property specifies the stack level of a box whose position value is one of absolute, fixed, or relative.
The z-axis position of each layer is expressed as an integer representing the stacking order for rendering. An element with a larger z-index overlaps an element with a lower one.
A z-index property can help you to create more complex webpage layouts. Following is the example which shows how to create layers in CSS.