JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<div class="row">
  <div class="col-md-6 col-md-pull-6">A</div>
  <div class="col-md-6 col-md-push-6">B</div>
  
</div>

CSS

.col-md-6{
    border: 1px solid black;
}