JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

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