how z index works?
How do you use Z-index?
If you want to create a custom stacking order, you can use the z - index property on a positioned element. The z - index property can be specified with an integer value (positive, zero, or negative), which represents the position of the element along the z -axis. Feb 19, 2021
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What does the Z-Index property control?
The z - index property in CSS controls the vertical stacking order of elements that overlap. As in, which one appears as if it is physically closer to you. z - index only affects elements that have a position value other than static (the default).
Full answer in: css-tricks.com
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What is Z-Index 9999?
CSS z - index property set a overlap value and base on overlap value to element positioning set from each other. CSS z - index property always work with absolute as well as relative positioning value. CSS z - index possible value 0, positive (1 to 9999 ) and negative (-1 to - 9999 ) value to set an element.
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