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Learn how to manage `z-index` for popups over sticky components in CSS without removing the sticky property.
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This video is based on the question https://stackoverflow.com/q/65959083/ asked by the user 'Baidyanath Ghosh' ( https://stackoverflow.com/u/10941482/ ) and on the answer https://stackoverflow.com/a/65959139/ provided by the user 'doğukan' ( https://stackoverflow.com/u/10698741/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing z-index for Popup Over Sticky Components in CSS

When creating modern web interfaces, you might find yourself in a scenario where elements overlap in unexpected ways. A common challenge arises when using sticky components alongside interactive popups. For instance, you may have two sticky boxes on your webpage, which trigger popups on hover. However, you want these popups to always display on top of their respective sticky boxes.

This dilemma is particularly frustrating when you realize that adjusting the z-index of one component can inadvertently hide the other popup. Fortunately, there is a straightforward solution that will allow you to achieve the desired effect without compromising the sticky positioning of your boxes.

The Intricacies of z-index

Understanding z-index

The z-index property in CSS specifies the stack order of elements. An element with a higher z-index value will appear in front of an element with a lower one. However, this stacking context can become complex, especially when using position properties like sticky, absolute, or relative.

Here's a simplified example of how z-index works:

Elements with a higher z-index will stack above elements with a lower z-index.

Elements positioned with position: relative, fixed, or absolute can influence the stacking context of child elements and siblings.

The Problem

In your scenario, when hovering over one sticky box to display its popup, the other sticky box's popup can be obscured. This happens because setting the same z-index on both boxes can cause them to compete for the same stacking level, meaning the one listed last in the HTML may display on top.

The Solution

The solution is simple: adjust the z-index value of the entire sticky box on hover. Below, I will walk you through the process of implementing this solution using CSS.

Step-by-Step Implementation

HTML Structure:
Below is the HTML outline of the two sticky boxes with popups that you will implement:

[[See Video to Reveal this Text or Code Snippet]]

CSS Modifications:
Here's the updated CSS, where we set the z-index for the box on hover:

[[See Video to Reveal this Text or Code Snippet]]

How It Works

By setting the z-index for .box:hover, it effectively elevates the hovered box above others, ensuring its respective popup is visible.

This chaining of hover effects allows for both popups to potentially overlap without being masked by one another since each box will maintain its visibility while hovered.

Conclusion

With this simple yet effective adjustment, you can successfully manage the display of popups over sticky elements on your webpage. No need to forgo the functionality of sticky positioning! This technique enhances your user interface by keeping it interactive and engaging.

Now that you know how to manage popups over sticky components, you can apply this knowledge to improve your web projects. Happy coding!