About the rasterized layout of BOOTSTRAP3

Container container for fixed-width and responsive layout support
The Container-fluid class is used for containers of 100% widths that occupy all viewports (viewport).

. col-xs-1-12 Mobile (<768PX)
. col-sm-1-12 Small Screen tablet (≥768px)
. col-md-1-12 Medium-screen desktop display (≥992px)
. col-lg-1-12 Large-screen large desktop display (≥1200px)

Column Offset col-xs/sm/md/lg-offset-*

Column sort col-xs/sm/md/lg-push-* Right offset------left:%;
Col-xs/sm/md/lg-pull-* left offset------right:%;

About the rasterized layout of BOOTSTRAP3