You can apply a z-index value only to an element for which you've declared a value for the position property.

Name: You can apply a z-index value only to an element for which you've declared a value for the position property.
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Quizplus · Accepted Answer

This is true. In order to apply a z-index value to an element, you must first declare a value for the position property (such as position: relative or position: absolute). This is because z-index only applies to positioned elements.

You Can Apply a Z-Index Value Only to an Element