I have a Bootstrap Page like this:
A
-
It's worth noting that if you are using columns that are not both equal to 6, then the push amount will not equal the initial column size.
If you have 2 columns (A & B) and wish for column A to be smaller and to the right on "sm" or greater viewports, but atop a mobile (xs) viewport, you would use the following:
A
B
Otherwise, the alignment of the columns will appear off.