JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css">
<body class='container'><!-- .container is already set up in survey-->
    <div class="row">
        <div class="main-content col-sm-9">Main Content</div>
        <div class="sidebar-content col-sm-3">Index Content</div>
    </div>
</body>

CSS

.container {
    background-color: red;
    color:#ffffff;
}
.main-content {
    background-color: blue;
    padding:20px;
}
.sidebar-content {
    background-color: green;
    padding:20px;
}