JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li>1</li>
    <li>2</li>
</ul>

CSS

li::before{
    content: url('http://jsfiddle.net/img/info-close.png');
    margin-left: 2px;
}
li:hover::before{
    content: url('http://jsfiddle.net/img/ico-add-resource.png');
    margin-left: 0px;
}