JSFiddle - React, Tailwind, and code Playground

HTML

<div id="footer">
  <div></div>
  <div></div>
  <div></div>
</div>

CSS

#footer div { display: block; float: left; background: #eee; height: 220px; width: 33%; }
#footer div:not(:first-child) { border-left: 1px solid #ccc; }