Z-index is an CSS element of HTML5.
Quote:
https://www.w3schools.com › cssref › pr_pos_z-index.asp
Definition and Usage. The z-index property specifies the stack order of an element.. An element with greater stack order is always in front of an element with a lower stack order. Note: z-index only works on positioned elements (position: absolute, position: relative, position: fixed, or position: sticky) and flex items (elements that are direct children of display:flex elements).
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You can try it out here: www.w3schools.com/cssref/tryit.asp?filename=trycss_zindex
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