Can the z-index of multiple CSS elements collaborate harmoniously?

Currently, I am trying to implement a feature where I need to display a notification dropdown on top of a carousel. To achieve this, I am utilizing the z-index property in my code. The challenge is that I have separate CSS files for the notification dropdown and the carousel.

I have assigned a higher z-index value for the notification dropdown and a lower one for the carousel in their respective CSS files. My concern is whether the z-index property will function correctly in this scenario with the separate CSS files for each component.

Answer №1

z-index is a CSS 2.1 box property (source). It doesn't matter which CSS file it's defined in, as long as it targets the correct box.

If conflicting indexes are specified in multiple files, CSS ambiguity rules come into play.

To gain a better understanding, CSS utilizes Stacking Contexts for content rendering. Check out Appendix E for more in-depth information.

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