JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <head>
        <style type="text/css">
            html, body {
                height: 100%;
            }
            .container {
                height: 100%;
                width: 600px;
                border: #000000 solid 1px;
                
            }


            .left {
                height: 100%;
            width: 290px;
            background: blue;
            }
            .right {
                height: 100%;
            width: 290px;
            background: red;
            }
        </style>
    </head>
    <body>
        <div class="container">
             <div class="left">
            </div>
            
            <div class="right">
            </div>
        </div>
    </body>
</html>