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