JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
 <div class="expandable">Details</div>
</div>

CSS

.expandable
{
    background: 
        transparent
        url('http://www.vlerickalumni.com/images/icons/plusIcon.gif') 
        no-repeat 
        -5px 5px;
}

.container
{
       width: 200px;
    background-color: #eee;
    margin: auto;
}