34.bootstrap grid

lg-larger desktop
md-desktop
sm-tab
xs-mobile


<div class="row">
<div class="col-md-3 col-sm-3 col-xs-12"></div>
<div class="col-md-4 col-sm-3 col-xs-12"></div>
<div class="col-md-2 col-sm-3 col-xs-12"></div>
<div class="col-md-3 col-sm-3 col-xs-12"></div>
</div>