Bootstrap has a wide range of responsive margin and padding utility classes. They work for all breakpoints:
xs (<=576px), sm (>=576px), md (>=768px), lg (>=992px) or xl (>=1200px))
The classes are used in the format:
{property}{sides}-{size} for xs & {property}{sides}-{breakpoint}-{size} for sm, md, lg, and xl.
m - sets margin
p - sets padding
t - sets margin-top or padding-top
b - sets margin-bottom or padding-bottom
l - sets margin-left or padding-left
r - sets margin-right or padding-right
x - sets both padding-left and padding-right or margin-left and margin-right
y - sets both padding-top and padding-bottom or margin-top and margin-bottom
blank - sets a margin or padding on all 4 sides of the element
0 - sets margin or padding to 0
1 - sets margin or padding to .25rem (4px if font-size is 16px)
2 - sets margin or padding to .5rem (8px if font-size is 16px)
3 - sets margin or padding to 1rem (16px if font-size is 16px)
4 - sets margin or padding to 1.5rem (24px if font-size is 16px)
5 - sets margin or padding to 3rem (48px if font-size is 16px)
auto - sets margin to auto
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