JSFiddle - React, Tailwind, and code Playground

HTML

<div class="ggg">blavlavbla </div>

JavaScript

function replaceClass()
         {
             var plusLinks = document.querySelectorAll('ggg');
             var firstLink = plusLinks[0];
             firstLink.setAttribute('class', 'aw-top-content-mod');
         }
        
 replaceClass();