JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bigger">
    <div id="smaller"></div>
</div>
<button id="Large">Large</button>

CSS

#bigger
{
border-style:dotted;
width:200px;
height:200px;
}
#smaller
{
    border-style:solid;
    border-color:red;
    width:100px;
    height:100px;
    
}

JavaScript

$("#Large").click(function(){
$("#smaller").width("300px");
});