JSFiddle - React, Tailwind, and code Playground

HTML

<div class="me">me</div>
<br>
<br>
<br>
 <div class="blah">blah</div>

CSS

.blah {
    padding: 5px;
    width: 200px;
    height: 20px;
    border: 1px solid #333;
    font-family: "Verdana";
    background-color:red;
}

.me {
    position: absolute;
    left: 5px;
    top: 5px;
}

JavaScript

$('.me').addClass('blah');