<div class="content-box">
 <div class="grid-row">
  <div class="col-xs">
   <div class="styleguide-section__grid-demo-element">Column 1 content</div>
  </div>
  <div class="col-xs">
   <div class="styleguide-section__grid-demo-element">Column 2 content</div>
  </div>
  <div class="col-xs">
   <div class="styleguide-section__grid-demo-element">Column 3 content</div>
  </div>
 </div><!--end of grid row-->
</div><!--end of content box-->