JSFiddle - React, Tailwind, and code Playground

HTML

<html>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css">
  <a class="stack-link stackoverflow" href="http://stackoverflow.com">StackOverflow</a>
</html>

CSS

.stackoverflow::before {
    font-family: 'FontAwesome';
    content: "\f16c  \00a0";
}