JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Bug</title>
    </head>
    <body>
        <div id="container">
            <nav id="navigation">
                <ul>                                
                    <li>
                        Hello, World!
                    </li>
                </ul>
            </nav>
        </div>
    </body>
</html>

CSS

html, body, div, span, applet, object, iframe,
            h1, h2, h3, h4, h5, h6, p, blockquote, pre,
            a, abbr, acronym, address, big, cite, code,
            del, dfn, em, img, ins, kbd, q, s, samp,
            small, strike, strong, sub, sup, tt, var,
            b, u, i, center,
            dl, dt, dd, ol, ul, li,
            fieldset, form, label, legend,
            table, caption, tbody, tfoot, thead, tr, th, td,
            article, aside, canvas, details, embed, 
            figure, figcaption, footer, header, hgroup, 
            menu, nav, output, ruby, section, summary,
            time, mark, audio, video {
                margin: 0;
                padding: 0;
                border: 0;
                font-size: 100%;
                font: inherit;
                vertical-align: baseline;
            }
            article, aside, details, figcaption, figure, 
            footer, header, hgroup, menu, nav, section {
                display: block;
            }
            body {
                line-height: 1;
            }
            ol, ul {
                list-style: none;
            }
            blockquote, q {
                quotes: none;
            }
            blockquote:before, blockquote:after,
            q:before, q:after {
                content: '';
                content: none;
            }
            table {
                border-collapse: collapse;
                border-spacing:0;
            }
            
            #container
            {
                position:relative;
                height:200px;
            }
            nav {
                position:absolute;
                right:0;
                left:0;
                bottom:0px;  
                height: 70px;
                border-bottom:4px solid #ff0000;
            }
            li {
                float:left;
                 line-height:70px; 
                border-right:1px solid #0000ff; 
            }
            li:hover {
  ...