JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div1">
<a rel="rel1" class="lien" >lien 1</a>
<a rel="rel2" class="lien" >lien 2</a>
</div>

CSS

.lien {color: #000;}

JavaScript

$("[rel='rel1']").css({"color":"#fff"})