bootstrap style grid code example
Example 1: bootstrap 3 offset
col-sm-offset-2
Example 2: bootstrap container width
--------------------------------------------------------------------------------------
Bootstrap Container Width | Size | Class Prefix
--------------------------------------------------------------------------------------
Extra small devices Phones (less than 768px) | None (auto) | .col-xs-
Small devices Tablets (greater than equals 768px) | 750px | .col-sm-
Medium devices Desktops (greater than equals 992px) | 970px | .col-md-
Large devices Desktops (greater than equals 1200px) | 1170px | .col-lg-