JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE HTML>
<head>
<title>Manor High School | Strive for Excellence</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
<link href="web/css/style.css" rel="stylesheet" type="text/css" media="all"/>
<link href="web/css/slider.css" rel="stylesheet" type="text/css" media="all"/>
<script type="text/javascript" src="web/js/jquery-1.9.0.min.js"></script>
<script type="text/javascript" src="web/js/jquery.nivo.slider.js"></script>
<script type="text/javascript">
    $(window).load(function() {
        $('#slider').nivoSlider();
    });
    </script>
    <script>
        <!-- tockify-button-start -->

        // <![CDATA[
        var _tkf_opta=_tkf_opta||[];_tkf_opta.push({"v":2,"name":"manor.high","position":"left","text":"View our Calendar","size":"medium","color":"dark","offset":200,"mobile":{"background":"dark"}});
        (function() {var d=document;var tk=d.createElement("script");tk.type="text/javascript";tk.async="true";tk.id="tkf_embed";tk.src="https://tockify.com/_tockify.embed.js";var s = d.getElementsByTagName("script")[0];s.parentNode.insertBefore(tk, s);})();
        // ]]>

        <!-- tockify-button-end -->

    </script>

</head>
<body>
	      <div class="header">
	      	<div class="header_top">
			        <div class="wrap">	 
					<div class="logo">
					   <a href="index.html"><img src="web/images/logo.png" alt="" /></a>
					</div>
						 <div class="menu">
						    <ul class= "top-level-menu" id="nav">
                                <li class="active"><a href="index.html">Home</a></li>
                                <li><a href="index.html">News & Events</a></li>
                                <li><a href="index.html">Parents & Pupils</a></li>

                                <li><a href="index.html">Community</a>
                                    <ul class="second-level-menu">
                                        <li>
       ...

CSS

/*
Author: W3layouts
Author URL: http://w3layouts.com
License: Creative Commons Attribution 3.0 Unported
License URL: http://creativecommons.org/licenses/by/3.0/
*/
 /* reset */
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,dl,dt,dd,ol,nav ul,nav 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;}
ol,ul{list-style:none;margin:0;padding:0;}
blockquote,q{quotes:none;}
blockquote:before,blockquote:after,q:before,q:after{content:'';content:none;}
table{border-collapse:collapse;border-spacing:0;}
/* start editing from here */
a{text-decoration:none;}
.txt-rt{text-align:right;}/* text align right */
.txt-lt{text-align:left;}/* text align left */
.txt-center{text-align:center;}/* text align center */
.float-rt{float:right;}/* float right */
.float-lt{float:left;}/* float left */
.clear{clear:both;}/* clear float */
.pos-relative{position:relative;}/* Position Relative */
.pos-absolute{position:absolute;}/* Position Absolute */
.vertical-base{	vertical-align:baseline;}/* vertical align baseline */
.vertical-top{	vertical-align:top;}/* vertical align top */
.underline{	padding-bottom:5px;	border-bottom: 1px solid #eee; margin:0 0 20px 0;}/* Add 5px bottom padding and a underline */
nav.vertical ul li{	display:block;}/* vertical menu */
nav.horizontal ul li{	display: inline-block;}/* horizontal menu */
img{max-width:100%;}
/*end reset*/
@font-face {
      font-family: 'ambleregular';
      src: url(../fonts/Amble-Regular-webfont.ttf) format('truetype');
}
body{
	font-family:Arial, Helvetica,...