JSFiddle - React, Tailwind, and code Playground

HTML

<div id='one' class='test'></div>
<div id='two' class='test two'></div>

CSS

.test{
    width:100px;
    height:100px;
}

JavaScript

var one = document.getElementById('one');
var two = document.getElementsByClassName('two');

var src = 'http://fc03.deviantart.net/fs70/i/2012/163/0/d/dog_with_glasses_by_danihee-d53949b.jpg';

one.style.backgroundImage = 'url('+src+')';
two.style.backgroundImage = 'url('+src+')';