JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li><a href="#"><div class="fbhover"></div></a></li>
</ul>

CSS

ul {
    list-style: none;
}

.fbhover {
    display: inline-block;
    width: 26px;
    height: 27px;
    background: url('http://i.imgur.com/nHJ6Loa.png') no-repeat 0 0;
}

.fbhover:hover {
    background-image: url('http://i.imgur.com/bdMNHnw.png');
}