JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="nav">
    <li><a href="#">foo</a></li>
    <li><a href="#">bar</a></li>
    <li><a href="#">baz</a></li>
</ul>

CSS

#nav li { display:inline; }
#nav li:before { content:' / '; }
#nav li:first-child:before { content:''; }