JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<button class="icon-button"><span class="glyphicon glyphicon-plus-sign"></span></button>

CSS

.icon-button {
    appearance: none;
    -webkit-appearance: none;
    -moz-appearance: none;
    outline: none;
    border: 0;
    background: transparent;
}