JSFiddle - React, Tailwind, and code Playground

HTML

<div id="thumbnail" onclick="fullImage()" class="thumbnail"></div>

CSS

#thumbnail {
    background-image: url("http://upload.wikimedia.org/wikipedia/commons/d/d3/Nelumno_nucifera_open_flower_-_botanic_garden_adelaide2.jpg");
}

.thumbnail {
    width: 64px;
    height: 64px;
    background-size: 200px 200px;
    background-position: center;
}



.full {
    width: 609px;
    height: 447px;
    cursor: pointer;
    background-size: 100% 100%;
    background-position: initial;
}

JavaScript

function fullImage() {
    $("#thumbnail").toggleClass("full");
}