Flexbox GridResponsiveResponsive modifiers enable specifying different column sizes, offsets, alignment and distribution at xs, sm, md & lg viewport widths. <div class="row"> <div class="col-xs-12 col-sm-8 col-md-6 col-lg-4"> <div class="box">Responsive</div> </div> </div> FluidPercent based widths allow fluid resizing of columns and rows. .col-xs-6 { flex-basis: 50%; }Simple SyntaxAll you need to remember is
要素の横幅と高さの比率を保つ | 集の一期一会
