Bootstrap 4 Grid System - W3Schools
www.w3schools.com › bootstrap4 › bootstrap_gridFor example, three equal columns would use three .col-sm-4; Column widths are in percentage, so they are always fluid and sized relative to their parent element; The biggest difference between Bootstrap 3 and Bootstrap 4 is that Bootstrap 4 now uses flexbox, instead of floats. One big advantage with flexbox is that grid columns without a ...