By studying the official website, I saw that cool-xs-offset was only implemented from the 3.0.1 version, so it includes version 3.0 .3 on my site.
Problem
What happens is that when I apply xs-offset (according to the example below), it also applies this offset to the other devices. Could not apply to XS only?
<div class="col-xs-offset-2 col-xs-8 col-sm-4">