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* Bump version to 5.3.0-alpha1 * Dist * Add docs versions updates * Update note in homepage hero Co-authored-by: Mark Otto <markdotto@gmail.com>
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| layout | title | description | group | toc | added |
|---|---|---|---|---|---|
| docs | Z-index | Use our low-level `z-index` utilities to quickly change the stack level of an element or component. | utilities | true | 5.3 |
Example
Use z-index utilities to stack elements on top of one another. Requires a position value other than static, which can be set with custom styles or using our [position utilities]({{< docsref "/utilities/position/" >}}).
{{< callout >}}
We call these "low-level" z-index utilities because of their default values of -1 through 3, which we use for the layout of overlapping components. High-level z-index values are used for overlay components like modals and tooltips.
{{< /callout >}}
{{< example class="bd-example-zindex-levels position-relative" >}}
{{< /example >}}Overlays
Bootstrap overlay components—dropdown, modal, offcanvas, popover, toast, and tooltip—all have their own z-index values to ensure a usable experience with competing "layers" of an interface.
Read about them in the [z-index layout page]({{< docsref "/layout/z-index" >}}).
Component approach
On some components, we use our low-level z-index values to manage repeating elements that overlap one another (like buttons in a button group or items in a list group).
Learn about our [z-index approach]({{< docsref "/extend/approach#z-index-scales" >}}).
CSS
Sass map
Customize this Sass map to change the available values and generated utilities.
{{< scss-docs name="zindex-levels-map" file="scss/_variables.scss" >}}