JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap-theme.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<div class="wrapper">
   <div class="center-block">Center Aligned DIV Box</div>
    <p><strong>Note:</strong> Play with .center-block width property value to understand how it works.</p>
</div>

CSS

.wrapper{
		margin: 20px;
		padding: 10px;
		background: #fffacd;
		border: 1px solid #000;
	}
    .center-block{
        width: 50%;
        padding: 30px;
        background: #e3b740;
    }