JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<style>
    *, html, body {
    	height: 100%;
        margin: 0;
    }

    body {
        overflow: hidden;
    }

    #wrapper {
        min-height: 100%;
        overflow: none;
    }

    #left {
        float: left;
        width: calc(100% - 200px);
        height: calc(100% - 20px);
        overflow-y: scroll;
    }

    #navigation {
        float: top;
        border-style: inset;
        background: lightgrey;
        padding: 5px;
        height: 16px;
        
    }

    .img {
        width: 16px;
        height: 16px;
        background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgBAMAAACBVGfHAAAAK3RFWHRDcmVhdGlvbiBUaW1lAM/tIDE5IOj+6yAyMDA0IDIwOjE2OjQzICswMzAwn4mdcgAAAAd0SU1FB9UFGg8uEROIcVQAAAAJcEhZcwAACxIAAAsSAdLdfvwAAAAEZ0FNQQAAsY8L/GEFAAAAKlBMVEX/AAC4jSzPr0yncQG8jA7+/qz9+JDKqTfGjgHvuQD66Wb6xwb7+NT+/v2CyXEoAAAAAXRSTlMAQObYZgAAAIVJREFUKM99zUERhFAMA9BawAIWagELsRALWPgWaiEWYgELeNkL7DDL7+bUvpmmEdt4JuIFQ3iE2wSA4zwPgLJLOYe7sdzA1Ue5AeJ7UnOQAJKS3ML9tBqwJUly9WDbrqoqzoAAZIsAoAnEyEwW18zMzJhARCS5X2MH2Jb4Dz/7G5Y1evgAaj7AUSA5oLUAAAAASUVORK5CYII=);
        no-repeat;
        vertical-align: middle; /* http://stackoverflow.com/a/489394/11926 */
        background-size:contain; /* http://stackoverflow.com/a/20708979/11926 */

    }
   
    #navigation li {
        height: 32px;
        margin-right: 5px;
        float: left;
        list-style-type: none;
        margin-right: 5px;
    }

    #navigation a {
        text-decoration: none;
        text-align: center;
        height: 16px;
    }

    .selected {
        font-size: 14px;
        padding-left: 5px;
        display: inline-block;
        vertical-align: center;
    }

    #messages {
        height: calc(100% - 50px);
        float: bottom;
        list-style-type: none;
        font-family: "verdana";
    }

    #users {
        float: right;
        width: 200px;
        height: calc(100% - 20px);
        overflow-y: scroll;
        font-family: "monospace";
       ...