JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<div class="container text-center"> 
            <h1>Sample tiles using bootstrap classes</h1>

            <div class="row">

                <div class="col-sm-6">
                    <a href="#" title="Image 1">
                        <img src="//placehold.it/250x250" class="thumbnail img-responsive danger" /></a>
                </div>
                <div class="col-sm-6 ">
                    <a href="#" title="Image 1">
                        <img src="//placehold.it/250x250" class="thumbnail img-responsive" /></a>
                </div>
                <div class="col-sm-6 ">
                    <a href="#" title="Image 1">
                        <img src="//placehold.it/250x250" class="thumbnail img-responsive" /></a>
                </div>
                <div class="col-sm-6 ">
                    <a href="#" title="Image 1">
                        <img src="//placehold.it/250x250" class="thumbnail img-responsive" /></a>
                </div>
            </div>
        </div>
    </div>

CSS

.thumbnail {
margin: 0 auto;
}