JSFiddle - React, Tailwind, and code Playground

HTML

<p>helooop</p>
     <p>helooop</p> 
     <p>helooop</p>
     <p>helooop</p>

JavaScript

var paragraphs = document.getElementsByTagName("p");    
for (var i = 0; i < paragraphs.length; i++) {    paragraphs[i].style.fontSize = '45px';    
}