JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">

<div class="container text-center">
    <div class="row">
        <div class="well well-lg clearfix">
            <div class="col-xs-12 col-md-6 pull-left">
                <div class="alert alert-success">1</div>
            </div>
            <div class="col-xs-12 col-md-6 pull-left">
                <div class="alert alert-warning">2</div>
            </div>
            <div class="col-xs-12 col-md-6 pull-right">
                <div class="alert alert-info">3</div>
            </div>
            <div class="col-xs-12 col-md-6 pull-right">
                <div class="alert alert-danger">4</div>
            </div>
        </div>
    </div>
        <div class="row">
            <p>what I would like larger screen to look like:</p>
        <div class="well well-lg clearfix">
            <div class="col-md-6">
                <div class="alert alert-success">1</div>
            </div>
            <div class="col-md-6">
                <div class="alert alert-info">3</div>
            </div>
            <div class="col-md-6">
                <div class="alert alert-warning">2</div>
            </div>
            <div class="col-md-6">
                <div class="alert alert-danger">4</div>
            </div>
        </div>
    </div>
</div>