Flexbox Cheat Sheet - Bootstrap 4
Bootstrap 4 BootstrapCreative.com: 21 Breakpoints Extra small devices (portrait phones, less than 576px) do not require a breakpoint because Bootstrap 4 is mobile first. Breakpoints | Max container width not needed=Extra small < 576px | None (auto) sm=Small ≥ 576px | 540px md=Medium ≥ 768px | 720px lg=Large ≥ 992px | 960px ................
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