Bootstrap v4 CSS includes a wide range of shorthand responsive margin and padding utility classes to modify an element's appearance.
How it worksAssign 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.
NotationSpacing 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-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
margin
or padding
on all 4 sides of the elementWhere 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
(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 * 0.25) !important; } .px-2 { padding-left: ($spacer * 0.5) !important; padding-right: ($spacer * 0.5) !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
.
<div class="mx-auto bg-info" style="width: 200px;">Centered element</div>
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