Utilities
For faster mobile-friendly and responsive development, Bootstrap includes dozens of utility classes for showing, hiding, aligning and spacing content.
Margin and Padding Spacing
Bootstrap includes a wide range of shorthand responsive margin and padding utility classes to modify an element’s appearance.
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.)
Text
Easily realign text to components with text alignment classes.
Left aligned text on all viewport sizes.
Center aligned text on all viewport sizes.
Right aligned text on all viewport sizes.
Left aligned text on viewports sized SM (small) or wider.
Centered aligned text on viewports sized MD (medium) or wider.
Right aligned text on viewports sized LG (large) or wider.
Left aligned text on viewports sized XL (extra-large) or wider.