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>

JavaScript

document.querySelector('.title').style.color = 'green';

for (let p of document.querySelectorAll('.para')) {
   p.style.color = 'red';
}