JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/font-awesome/2.0/css/font-awesome.css">
<span class="class"></span>

CSS

.class:after {
   content: "\f005\f005\f005"; /* 3 Stars */
    font-family: FontAwesome;
}