JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<b class="caret"></b>
<b class="right-caret"></b>

CSS

body {padding: 10px;}
.caret {
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid #000000;
    display: inline-block;
    height: 0;
    opacity: 0.3;
    vertical-align: top;
    width: 0;
}

.right-caret {
    border-bottom: 4px solid transparent;
    border-top: 4px solid transparent;
    border-left: 4px solid #000000;
    display: inline-block;
    height: 0;
    opacity: 0.3;
    vertical-align: top;
    width: 0;
}