JSFiddle - React, Tailwind, and code Playground

HTML

<div class="primary"><div class="secondary"><img src="http://www.hawaiianimals.org/monkey-5263_whitw_op_640x480.jpg" alt=""></div></div>
<div class="primary"><div class="secondary"><img src="http://ummahweb.net/wp-content/uploads/2010/04/z78.jpg" alt=""></div></div>
<div class="primary"><div class="secondary"><img src="http://www.och.lt/uploads/posts/2012-05/1337279564_podb_6.jpg" alt=""></div></div>
<div class="primary"><div class="secondary"><img src="http://xemanhdep.com/gallery/black_white_photos/black_white_photos26.jpg" alt=""></div></div>

CSS

.primary {
    border: 1px solid #CCC;
    padding: 20px;
    margin: 20px;
    box-sizing: border-box;
    -moz-box-sizing: border-box;
    display: inline-block;
    width: 300px;
    height: 300px;
}
.secondary {
    position: relative;
    width: 260px;
    height: 260px;
}
img {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    max-height: 100%;
    max-width: 100%;
    display: block;
    margin: auto;
}