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";
var paras=document.querySelectorAll('.para');
for(i=0; i<paras.length; i++){
	paras[i].style.color='red';
}