JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bonjour">salute</div>

CSS

#bonjour {
    background-image : url(http://rosalienebacchus.files.wordpress.com/2012/04/planet-earth-from-space.jpg);
    width : 500px;
    height : 500px;
    background-color : #123456;
    background-size : cover;
}

#bonjour:hover {
        background-image : url(http://www.desktopas.com/files/2013/06/Outer-Space-Moon-Earth-Spaceman.jpg);
}