Grid
On Bootstrap grid system, 12 / (cols) = col-lg-(each-col-width-taken), like 12/3 = col-lg-4, 12/5 = col-lg-2.4
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
col-lg-2
col-lg-2
col-lg-2
col-lg-2
col-lg-2
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
col-lg-1
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