JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/css/font-awesome.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/fonts/FontAwesome.otf"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/fonts/fontawesome-webfont.eot"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/fonts/fontawesome-webfont.svg"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/fonts/fontawesome-webfont.ttf"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.1.0/fonts/fontawesome-webfont.woff"></script>
<a href="#">This is a link</a>

CSS

body {
    font-family: Arial;
    font-size: 13px;
}

a {
    text-decoration: none;
    color: #515151;
}

a:before {
   font-family: FontAwesome;
   content: "\f095";
   display: inline-block;
   padding-right: 3px;
   vertical-align: middle;
}

a:hover:before {
   content: "\f099";
}