JSFiddle - React, Tailwind, and code Playground
HTML
<a href="#">test</a>
<a href="#" class="active">test</a>
<a href="#">test</a>
CSS
a.active + a { background:yellow }
a.active - a { background:red }
<a href="#">test</a>
<a href="#" class="active">test</a>
<a href="#">test</a>
a.active + a { background:yellow }
a.active - a { background:red }