JSFiddle - React, Tailwind, and code Playground

HTML

<h1 class="title">
  Hide me
</h1>

<p class="para">
  Hide me
</p>
<p class="para">
  Hide me
</p>
<p class="para">
  Hide me
</p>

JavaScript

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

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