Bootstrap includes a powerful mobile-first flexbox grid system for building layouts of all shapes and sizes. It’s based on a 12 column layout and has multiple tiers, one for each media query range. You can use it with Sass mixins or our predefined classes.
Equal-width
Setting one column width
Variable width content
Equal-width multi-row
All breakpoints
Stacked to horizontal
Mix and match
Vertical alignment
Horizontal alignment
No gutters
Column wrapping
Column resets
Flex order
Offsetting columns