mirror of
https://github.com/twbs/bootstrap.git
synced 2024-11-29 11:24:18 +01:00
106 lines
4.1 KiB
Markdown
106 lines
4.1 KiB
Markdown
---
|
|
layout: docs
|
|
title: Spacing
|
|
description: Bootstrap includes a wide range of shorthand responsive margin and padding utility classes to modify an element's appearance.
|
|
group: utilities
|
|
toc: true
|
|
---
|
|
|
|
## 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:
|
|
|
|
{% highlight scss %}
|
|
.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;
|
|
}
|
|
{% endhighlight %}
|
|
|
|
### 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`.
|
|
|
|
<div class="bd-example">
|
|
<div class="mx-auto" style="width: 200px; background-color: rgba(86,61,124,.15);">
|
|
Centered element
|
|
</div>
|
|
</div>
|
|
|
|
{% highlight html %}
|
|
<div class="mx-auto" style="width: 200px;">
|
|
Centered element
|
|
</div>
|
|
{% endhighlight %}
|
|
|
|
### 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`:
|
|
|
|
{% highlight scss %}
|
|
.mt-n1 {
|
|
margin-top: -0.25rem !important;
|
|
}
|
|
{% endhighlight %}
|
|
|
|
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`.
|
|
|
|
{% capture example %}
|
|
<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>
|
|
{% endcapture %}
|
|
{% include example.html content=example %}
|