JSFiddle - React, Tailwind, and code Playground

HTML

<div class="drop"> 
			<ul class="drop_menu">
				<div class="logo"></div>
                    <li><a href="#">Item1</a>
                        <ul>
                            <li><a href="#">Subitem1</a></li>
                            <li><a href="#">Subitem2</a></li>
                            <li><a href="#">Subitem3</a></li>
                        </ul>
                </li>
                <li><a href="#">Item2</a></li>
                <li><a href="#">Item3</a></li>
                <li><a href="#">Item4</a></li>
<li><a href="#">Item5</a></li>
			</ul> 
		</div>

CSS

/* http://meyerweb.com/eric/tools/css/reset/ 
   v2.0 | 20110126
   License: none (public domain)
*/

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;
}
/* HTML5 display-role reset for older browsers */
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;
}

/* CSSTerm.com Simple Horizontal DropDown CSS menu */

.drop_menu {
	background:#000;
	padding:0;
	margin:0;
	list-style-type:none;
	height:30px;
	position:fixed;
	min-width:100%;
}
.drop_menu li { display:inline-block; }
.drop_menu li a {
	padding:9px 10px;
	display:block;
	color:#eee;
	text-decoration:none;
	font:12px arial, verdana, sans-serif;
}

/* Submenu */
.drop_menu ul {
	position:absolute;
	left:-9999px;
	top:-9999px;
	list-style-type:none;
}
.drop_menu li:hover { position:relative; background:#444; }
.drop_menu li:hover ul {
	left:0px;
	top:30px;
	background:#444;
	padding:0px;
}

.drop_menu li:hover ul li a {
	padding:5px;
	display:block;
	width:168px;
	text-indent:15px;
	background-color:#444;
}
.drop_menu li:hover ul li a:hover { background:#000;}

/* my own css for the logo */

.logo {
//	background-image:url();
	width:90px;
	height:20px;
	margin:2px 6px 0...