Extra small <576px Small ≥576px Medium ≥768px Large ≥992px Extra large ≥1200px 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 30px (15px on each side of a column) Nestable Yes Column ordering Yes Nosomovo