description: Bootstrap includes a wide range of shorthand responsive margin, padding, and gap utility classes to modify an element's appearance.
group: utilities
toc: true
---
## Margin and padding
Assign responsive-friendly `margin` or `padding` values to an element or a subset of its sides with shorthand classes. Includes support for individual properties, all properties, and vertical and horizontal properties. Classes are built from a default Sass map ranging from `.25rem` to `3rem`.
{{<callout>}}
**Using the CSS Grid layout module?** Consider using [the gap utility](#gap) instead.
{{</callout>}}
### Notation
Spacing utilities that apply to all breakpoints, from `xs` to `xxl`, have no breakpoint abbreviation in them. This is because those classes are applied from `min-width: 0` and up, and thus are not bound by a media query. The remaining breakpoints, however, do include a breakpoint abbreviation.
The classes are named using the format `{property}{sides}-{size}` for `xs` and `{property}{sides}-{breakpoint}-{size}` for `sm`, `md`, `lg`, `xl`, and `xxl`.
Where *property* is one of:
-`m` - for classes that set `margin`
-`p` - for classes that set `padding`
Where *sides* is one of:
-`t` - for classes that set `margin-top` or `padding-top`
-`b` - for classes that set `margin-bottom` or `padding-bottom`
-`s` - (start) for classes that set `margin-left` or `padding-left` in LTR, `margin-right` or `padding-right` in RTL
-`e` - (end) for classes that set `margin-right` or `padding-right` in LTR, `margin-left` or `padding-left` in RTL
-`x` - for classes that set both `*-left` and `*-right`
-`y` - for classes that set both `*-top` and `*-bottom`
- blank - for classes that set a `margin` or `padding` on all 4 sides of the element
Where *size* is one of:
-`0` - for classes that eliminate the `margin` or `padding` by setting it to `0`
-`1` - (by default) for classes that set the `margin` or `padding` to `$spacer * .25`
-`2` - (by default) for classes that set the `margin` or `padding` to `$spacer * .5`
-`3` - (by default) for classes that set the `margin` or `padding` to `$spacer`
-`4` - (by default) for classes that set the `margin` or `padding` to `$spacer * 1.5`
-`5` - (by default) for classes that set the `margin` or `padding` to `$spacer * 3`
-`auto` - for classes that set the `margin` to auto
(You can add more sizes by adding entries to the `$spacers` Sass map variable.)
### Examples
Here are some representative examples of these classes:
```scss
.mt-0 {
margin-top: 0 !important;
}
.ms-1 {
margin-left: ($spacer * .25) !important;
}
.px-2 {
padding-left: ($spacer * .5) !important;
padding-right: ($spacer * .5) !important;
}
.p-3 {
padding: $spacer !important;
}
```
### Horizontal centering
Additionally, Bootstrap also includes an `.mx-auto` class for horizontally centering fixed-width block level content—that is, content that has `display: block` and a `width` set—by setting the horizontal margins to `auto`.
In CSS, `margin` properties can utilize negative values (`padding` cannot). These negative margins are **disabled by default**, but can be enabled in Sass by setting `$enable-negative-margins: true`.
The syntax is nearly the same as the default, positive margin utilities, but with the addition of `n` before the requested size. Here's an example class that's the opposite of `.mt-1`:
When using `display: grid` or `display: flex`, you can make use of `gap` utilities on the parent element. This can save on having to add margin utilities to individual children of a grid or flex container. Gap utilities are responsive by default, and are generated via our utilities API, based on the `$spacers` Sass map.
Support includes responsive options for all of Bootstrap's grid breakpoints, as well as six sizes from the `$spacers` map (`0`–`5`). There is no `.gap-auto` utility class as it's effectively the same as `.gap-0`.
Spacing utilities are declared in our utilities API in `scss/_utilities.scss`. [Learn how to use the utilities API.]({{< docsref "/utilities/api#using-the-api" >}})
