JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://getbootstrap.com/dist/css/bootstrap.css">
<div class="container"> <div class="row"> <div class="col-md-12">header section</div> </div> <div class="row"> <div class="col-md-4">Navigation</div> <div class="col-md-8">Content</div> </div> </div>

CSS

.col-md-4 {
    background-color: red;
}

.col-md-8 {
    background-color: yellow;
}