Use our powerful mobile-first flexbox grid to build layouts of all shapes and sizes thanks to a twelve column system, six default responsive tiers, Sass variables and mixins, and dozens of predefined classes.

Grid Options on Bootstrap

Grid Options

See how aspects of the Bootstrap grid system work across multiple devices with a handy table.

Extra small
<576px
Small
≥576px
Medium
≥768px
Large
≥992px
Extra Large
≥1200px
Extra Large
≥1400px
Container max-width None (auto) 540px 720px 960px 1140px 1320px
Class prefix .col- .col-sm- .col-md- .col-lg- .col-xl- .col-xxl-
# of columns 12
Gutter width 1.25rem (0.625rem on left and right)
Custom gutters Yes
Nestable Yes
Column ordering Yes