JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://jquery-ui.googlecode.com/svn/trunk/ui/jquery.ui.core.js"></script>
<script src="http://jquery-ui.googlecode.com/svn/trunk/ui/jquery.ui.position.js"></script>
<div class="main">
    <div class="one"></div>
</div>

CSS

.main {
    width: 90%;
    height:200px;
    background:#000;
    position: relative;
}


.one {
    width: 20px;
    height:20px;
    background:#f00;
    position:absolute;
    top:0;
    right:0;
}