Cacher is the code snippet organizer for pro developers

li {
    float:left;
    width: 100px;
    height: 100px;
    list-style: none;
}
li a {
    line-height: 100px;
}
li a img {
    vertical-align: middle;
}

<ul>
    <li><a href="#"><img src="http://placehold.it/80x100" /></a></li>
    <li><a href="#"><img src="http://placehold.it/100x80" /></a></li>
</ul>