JSFiddle - React, Tailwind, and code Playground

HTML

<div class="style">
<style>.bla{ width: 200px;}</style>
</div>
<div id="divs"></div>
<button id="adddiv">Add div</button>
<button id="changeWidth">Click To Change Width</button>

JavaScript

$(function(){
$("#adddiv").click(function(){
$("#divs").append('<div class="bla" style="border:1px solid red;height:20px;margin:2px;">');
});
$("#changeWidth").click(function(){
$(".style").html("<style>.bla{width:300px;}</style>")
});
});