JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bar"></div>

CSS

#bar {
    position: absolute;
    left: 100px;
    top: 10px;
    height: 10px;
    width: 0;
    background: red;
}

JavaScript

$('#bar').animate({
    left: 0,
    width: 100
});