<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<div class="container">
<div class="row">
<div class="kudos-wrap">
<ul>
<li><input type="checkbox" id="cb1" />
<label for="cb1"><img src="http://lorempixel.com/100/100" /></label>
</li>
<li><input type="checkbox" id="cb2" />
<label for="cb2"><img src="http://lorempixel.com/101/101" /></label>
</li>
<li><input type="checkbox" id="cb3" />
<label for="cb3"><img src="http://lorempixel.com/102/102" /></label>
</li>
<li><input type="checkbox" id="cb4" />
<label for="cb4"><img src="http://lorempixel.com/103/103" /></label>
</li>
</ul>
</div>
</div>
</div>
