JSFiddle - React, Tailwind, and code Playground

HTML

<div class="progressbar"></div>
<button>pause/continue</button>

CSS

.progressbar {
    height: 2em;
    border:1px solid #000;
    border-radius:5px;
    background-image: url(http://code.jquery.com/ui/1.10.3/themes/smoothness/images/animated-overlay.gif);
}
.stop {
    background-image: none;
}

JavaScript

$('button').bind('click', function(){    
    $('.progressbar').toggleClass('stop');
});