JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<div class="container">
    <div class='row'>
        <div class="col-xs-2">
            <a href="/url/to/object">
	            <img class="img-circle img-responsive" src="https://pensivepool.files.wordpress.com/2012/01/josef-albers-study-for-homage-to-the-square-silkscreen-print-80774.jpg">
            </a>
        </div>
        <div class="col-xs-2">
            <a href="/url/to/object">
	            <img class="img-circle img-responsive" src="https://pensivepool.files.wordpress.com/2012/01/josef-albers-study-for-homage-to-the-square-silkscreen-print-80774.jpg">
            </a>
        </div>
        <div class="col-xs-2">
            <a class="btn btn-default btn-circle btn-responsive" href="#link_to_add_new">
	            <i class="fa fa-plus"></i>
            </a>
        </div>
    </div>
</div>

CSS

@import url('//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap-theme.min.css');

.btn-circle {
  width: 30px;
  height: 30px;
  text-align: center;
  padding: 60px 0;
  font-size: 12px;
  line-height: 1.428571429;
  border-radius: 15px;
}
.btn-circle.btn-responsive {
  border-radius: 50% !important;
  width: 100% !important;
  padding: 0 !important;
  padding-bottom: 100%!important;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  border: 0;
  box-shadow: 0 0 0 1px #ccc;  
}

.btn-circle.btn-responsive i{
  height: auto;
  max-height: 12px;
  overflow: hidden;
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  padding: 0;
  line-height: 1em;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}