JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<div class="row">
    <div class="col-xs-6">
        <div class="col-xs-12">1</div>
        <div class="col-xs-12">2</div>
        <div class="col-xs-12">
            <div class="row">
                <div class="col-xs-6">3</div>
                <div class="col-xs-6">4</div>
            </div>
        </div>
    </div>
    <div class="col-xs-6">
        <div class="col-xs-12">5</div>
        <div class="col-xs-12">
            <div class="row">
                <div class="col-xs-6">6</div>
                <div class="col-xs-6">7</div>
            </div>
        </div>
        <div class="col-xs-12">8</div>
    </div>
</div>

CSS

div {
    border: 1px solid gray;
}