JSFiddle - React, Tailwind, and code Playground

HTML

<section class="language">
   <a href="/en/">
       <abbr lang="en" title="english">EN</abbr>
   </a>
   <a href="/spa/">
       <abbr lang="es" title="english">ES</abbr>
   </a>
   <a href="http://whatever.com/" rel="author">Designed by me</a>
</section>

CSS

.language a:not([rel]){
    background:#F00;
}