col-sm-* bootstrap 4 code example
Example 1: col-md bootstrap 4
.col-xs-12 col-md-8
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6 .col-md-4
.col-xs-6
.col-xs-6
Example 2: bootsrap 4 grid
One of three columns
One of three columns
One of three columns