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CSS Z-index
The z-index property in CSS controls the stacking order of elements along the z-axis (i.e., front-to-back order). It determines which elements appear in front of or behind other elements on the page.
Syntax:
z-index: <value>;
Value:Positive, negative, or 0 (e.g., 1, 100, -1).
Rule of using Z-index
The element must have a position value of:relative,absolute,fixed,sticky
Elements with a higher z-index will appear in front of elements with a lower z-index.