Bootstrap/site/content/docs/5.2/utilities/z-index.md

layout	title	description	group	toc
docs	Z-index	Use our low-level `z-index` utilities to quickly change the stack level of an element or component.	utilities	true

Example

{{< added-in "5.3.0" >}}

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" >}}