JSFiddle - React, Tailwind, and code Playground

HTML

<div class="tweet"></div>
<div class="tweet"></div>
<div class="tweet"></div>

CSS

.tweet {
   margin: 5px;
   width: 50px;
   height: 50px;
   background: red;
}

.blue {
   background: blue;
}

JavaScript

$(".tweet:not(.tweet:first)").addClass('blue');