JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title></title>

        <style type="text/css">
            .mbl {
                width: 100%;
                height: 100%;
                background: #33CC66; 
                padding: 5px; 
                border: solid 1px black; 
            }
        </style>

    </head>
    <body bgcolor="339933">
        <div class="mbl">
            HAI
        </div>
    </body>
</html>