JSFiddle - React, Tailwind, and code Playground

HTML

<div id='button'></div>

CSS

#button {
    width: 329px;
    height: 328px;
    background-image: url('hthttp://www.fnordware.com/superpng/pnggrad8rgb.png');
}
#button:hover {
    background-image: url('http://upload.wikimedia.org/wikipedia/commons/e/e3/Lomo-lca_sample.png');
}