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Grid options

While Bootstrap u ses or for defining most sizes,are used for grid breakpoints and container widths. This is because the viewport width is in pixels and does not change with the font size. See how aspects of the Bootstrap grid system work across multiple devices with a handy table.

Extra small
Extra large
Max container width None (auto) 540px 720px 960px 1140px
Class prefix .col- .col-sm- .col-md- .col-lg- .col-xl-
# of columns 12
Gutter width 24px (12px on each side of a column)
Nestable Yes
Column ordering Yes