JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css">
<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<i class="fa fa-cog fa-spin" aria-hidden="true"></i>

CSS

.fa-cog {
  display: none;
}

JavaScript

$(".fa-cog").show();