JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/font-awesome/4.2.0/css/font-awesome.min.css">
<div id="container">
  <i class="fa fa-user-md"></i>
</div>

CSS

#container {
  border-bottom: 1px solid black;
}
.fa {
  /*font-weight: 700;*/
}