Programming Tips - How can I stop bootstrap from stacking my columns?

Date: 2017apr13 Product: Twitter Bootstrap Library: Bootstrap Language: CSS Keywords: wrap, wrapping Q. How can I stop bootstrap from stacking my columns? A. Use the "xs" classes. Change:
<div class="row"> <div class="col-sm-3"> ... </div> ... </div>
To:
<div class="row"> <div class="col-xs-3"> ... </div> ... </div>