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| layout | title | description | group | toc |
|---|---|---|---|---|
| docs | Utilities for layout | For faster mobile-friendly and responsive development, Bootstrap includes dozens of utility classes for showing, hiding, aligning, and spacing content. | layout | true |
Changing display
Use our [display utilities](/docs/{{< param docs_version >}}/utilities/display/) for responsively toggling common values of the display property. Mix it with our grid system, content, or components to show or hide them across specific viewports.
Flexbox options
Bootstrap 4 is built with flexbox, but not every element's display has been changed to display: flex as this would add many unnecessary overrides and unexpectedly change key browser behaviors. Most of [our components](/docs/{{< param docs_version >}}/components/alerts/) are built with flexbox enabled.
Should you need to add display: flex to an element, do so with .d-flex or one of the responsive variants (e.g., .d-sm-flex). You'll need this class or display value to allow the use of our extra [flexbox utilities](/docs/{{< param docs_version >}}/utilities/flex/) for sizing, alignment, spacing, and more.
Margin and padding
Use the margin and padding [spacing utilities](/docs/{{< param docs_version >}}/utilities/spacing/) to control how elements and components are spaced and sized. Bootstrap 4 includes a five-level scale for spacing utilities, based on a 1rem value default $spacer variable. Choose values for all viewports (e.g., .mr-3 for margin-right: 1rem), or pick responsive variants to target specific viewports (e.g., .mr-md-3 for margin-right: 1rem starting at the md breakpoint).
Toggle visibility
When toggling display isn't needed, you can toggle the visibility of an element with our [visibility utilities](/docs/{{< param docs_version >}}/utilities/visibility/). Invisible elements will still affect the layout of the page, but are visually hidden from visitors.