JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>test</title>
</head>
<body>
    <div id="trigger">click me</div>
    <div id="some-selector">test</div>
</body>
</html>

CSS

#some-selector {
    width: 200px;
    padding: 20px 0;
    background: red;
}

JavaScript

$('#trigger').click(function () {
    $('#some-selector').animate({'width': '100%'}, 250);
});