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# Spacing

Bootstrap includes a wide range of shorthand responsive margin and padding utility classes to modify an element’s appearance.

## How it works

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`.

## Notation

Spacing utilities that apply to all breakpoints, from `xs` to `xl`, 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`, and `xl`.

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`
- `l` - for classes that set `margin-left` or `padding-left`
- `r` - for classes that set `margin-right` or `padding-right`
- `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:

    .mt-0 {
      margin-top: 0 !important;
    }

    .ml-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`.

Centered element

    <div class="mx-auto" style="width: 200px;">
      Centered element
    </div>

### Negative margin

In CSS, `margin` properties can utilize negative values (`padding` cannot). As of 4.2, we’ve added negative margin utilities for every non-zero integer size listed above (e.g., `1`, `2`, `3`, `4`, `5`). These utilities are ideal for customizing grid column gutters across breakpoints.

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`:

    .mt-n1 {
      margin-top: -0.25rem !important;
    }

Here’s an example of customizing the Bootstrap grid at the medium (`md`) breakpoint and above. We’ve increased the `.col` padding with `.px-md-5` and then counteracted that with `.mx-md-n5` on the parent `.row`.

Custom column padding
Custom column padding

    <div class="row mx-md-n5">
      <div class="col px-md-5"><div class="p-3 border bg-light">Custom column padding</div></div>
      <div class="col px-md-5"><div class="p-3 border bg-light">Custom column padding</div></div>
    </div>