What is class=”mb-0″ in Bootstrap 4?

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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

See more at Bootstrap 4.5 – Spacing

Read more in w3schools

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