Grid System

          Base on Bootstrap grid system, you can get the columns as you want. 12 / (cols) = col-lg-(each-col-width-taken), like 12/3 = col-lg-4, 12/5 = col-lg-2.4 (replace the '.' with '-')

          col-lg-12
          col-lg-6
          col-lg-6
          col-lg-4
          col-lg-4
          col-lg-4
          col-lg-3
          col-lg-3
          col-lg-3
          col-lg-3
          col-lg-2-4
          col-lg-2-4
          col-lg-2-4
          col-lg-2-4
          col-lg-2-4
          col-lg-2
          col-lg-2
          col-lg-2
          col-lg-2
          col-lg-2
          col-lg-2

          Mobile, tablet, and desktop

          col-xs-6
          col-xs-6
          col-lg-8
          col-sm-6
          col-sm-6
          col-lg-6
          col-md-6
          col-md-6
          col-lg-4
          col-sm-6
          col-sm-6