JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="content">
  <i class="fa fa-square delimiter"></i>
  <i class="fa fa-square delimiter"></i>
  <i class="fa fa-square delimiter"></i>
  <i class="fa fa-square"></i>
  <i class="fa fa-square"></i>
</div>

CSS

.content i {
  position: relative;
  font-size: 14px;
  padding: 0 8px;
  color: rgba(0, 0, 0, 0.3);
}

.content i.delimiter {
  color: #000;
}


i.delimiter + i:not(.delimiter) {
  color:blue;
}


i.delimiter + i:not(.delimiter)::before {
  content: '|';
  font-size: 18px;
  color: red;
  height:100%;
  top:0;
  width:2px;
  position: absolute;