JSFiddle - React, Tailwind, and code Playground

HTML

<div id="animTarget"><p>Click me!</p></div>

CSS

#animTarget {
    width: 80px;
    height: 80px;       
    background-color: black;
    color: #f00;
    transition: background-color 1s;
    -moz-transition: background-color 1s; /* Firefox 4 */
    -webkit-transition: background-color 1s; /* Safari and Chrome */
    -o-transition: background-color 1s; /* Opera */
}
#animTarget.white {
    background-color: white;            
}

JavaScript

$(function () {
    $('#animTarget').click(function () {
        $(this).toggleClass('white');
    });
});