JSFiddle - React, Tailwind, and code Playground

HTML

<h1 class="title">
  Make me green
</h1>

<p class="para">
  Make me red
</p>
<p class="para">
  Me red too
</p>
<p class="para">
  Also me
</p>
<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>

JavaScript

$('.title').css('color', 'green');
$('.para').css('color', 'red');