JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css">
<div class="row">
    <div class="col-xs-4 tall">25%</div>
    <div class="col-xs-8 tall">75%</div>
</div>

CSS

@import url('//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap-theme.min.css');

.row {
    border: 2px solid red;
}

.tall {
    border: 2px dotted black;
    height: 200px;
}