JSFiddle - React, Tailwind, and code Playground

HTML

<div id=foo></div>

CSS

body
{
    background: #aaa;
}

#foo
{
    width: 100px;
    height: 100px;
}

JavaScript

$(document).ready(function() {
    
    var foo = $('#foo')
        
    foo.css('background', '#c33');
    
    setTimeout( function() {
      foo.css('background', '#33c');
    }, 2000); // 2000ms = 1s

});