JSFiddle - React, Tailwind, and code Playground

HTML

<div class="closed"></div>

CSS

.closed {
    background-image: url(https://www.aristo.com.hk/images/chist_banner_2017.png);
    width:300px;
    height:300px;
}

JavaScript

$(document).ready(function() {
    alert('image will change');
    $('.closed').css({'background-image' : 'url(https://www.aristo.com.hk/images/Coursebook launch banner.jpg)'}); 
});