Bootstrap V4 CSS includes a wide range of shorthand responsive margin and padding utility classes to modify an element's appearance.
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.
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 marginp
- for classes that set paddingWhere sides is one of:
t
- for classes that set margin-top or padding-topb
- for classes that set margin-bottom or padding-bottoml
- for classes that set margin-left or padding-leftr
- for classes that set margin-right or padding-rightx
- for classes that set both -left and -righty
- for classes that set both -top and -bottomWhere size is one of:
0
- for classes that eliminate the margin or padding by setting it to 01
- (by default) for classes that set the margin or padding to $spacer * .252
- (by default) for classes that set the margin or padding to $spacer * .53
- (by default) for classes that set the margin or padding to $spacer4
- (by default) for classes that set the margin or padding to $spacer * 1.55
- (by default) for classes that set the margin or padding to $spacer * 3(You can add more sizes by adding entries to the $spacers Sass map variable.)
Here are some representative examples of these classes:
.mt-0 {
margin-top: 0 !important;
}
.ml-1 {
margin-left: ($spacer * .25) !important;
}
.px-2 {
padding-left: ($spacer * .5) !important;
padding-right: ($spacer * .5) !important;
}
.p-3 {
padding: $spacer !important;
}
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="mx-auto bg-info" style="width: 200px;">
Centered element
</div>
<!-- horizontal-cetering.vue -->