JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
    <div></div>
    <div></div>
    <div></div>
    <div></div>
    <div class="element5"></div>
</div>

CSS

#wrapper{width:300px;height:300px;background-color:#aaa;position:relative;}

#wrapper div{width:50px;height:50px;background-color:#111;float:left;margin-right:10px;}

#wrapper .element5{background-color:green;position:absolute;top:0;left:0;}