JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">
        <div id="sidebar">sidebar</div>
        <div id="messages">
            a message
        </div>
    </div>

CSS

body {
        background-color : red;
    }

    #content {
        background-color: blue;
    }

    #sidebar {
        background-color: yellow;
        float: right;
    }

    #messages {
        background-color: green;
        margin-top : 20px;
    }