JSFiddle - React, Tailwind, and code Playground

HTML

<!doctype html>
<html>
	<head>

		<title>My Website</title>

		<meta charset="utf-8" />

		<link href="css/style.css" type="text/css" rel="stylesheet"/>

	</head>

	<body>

	<div class="container">

	<div class="navigation">
	<ul id="nav">
		<li><a href="#">Home</a></li>
		<li><a href="#">News</a>
			<ul>
			<li><a href="#">News 1</a></li>
			<li><a href="#">News 2</a></li>
			</ul>
		</li>
		<li><a href="#">Archives</a>
			<ul>
			<li><a href="#">Archive 1</a></li>
			<li><a href="#">Archive 2</a></li>
			<li><a href="#">Archive 3</a></li>
			<li><a href="#">Archive 4</a></li>
			<li><a href="#">Archive 5</a></li>
			<li><a href="#">Archive 6</a></li>
			</ul>
		</li>
		<li><a href="#">Links</a>
			<ul>
			<li><a href="#">Links 1</a></li>
			<li><a href="#">Links 2</a></li>
			<li><a href="#">Links 3</a></li>
			</ul>
		</li>
		<li><a href="#">About</a></li>
	</ul>
	</div>

	<div class="main-wrap">
		<div class="main1"> 
		<h1 id="top"> Hello World!!! </h1>

			<p> First paragraph </p>

			<h2> Things I Must Do Today</h2>

				<ul>
					<li> <a href="http://google.be" target="_blank" id="externallink"> Go to the mall </a> </li>
					<li> Shop </li>
					<li> Get gas</li>
					<li> Drive home </li>
				</ul>

			<p><img src="img/koala.jpeg" alt="a koala sitting in a tree" align="left"/>

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CSS

* {
  -webkit-box-sizing: border-box;
     -moz-box-sizing: border-box;
          box-sizing: border-box;
}

body {
    width: 960px;
	margin: 0 auto;
	background: #099;
	font-family: Arial, Verdana, sans-serif;
}

/* website layout */

.container {
	
}

.navigation {
	margin: 20px 0px;
	padding: 5px 0px;
	background-color: #efefef;
	height: 70px;
}

.main-wrap {
	display: table;
	width: 1000px; /* Container width + 2 x 20px */
	border-spacing: 20px 0;
	margin-left: -20px; /* to adjust centering because of increased width (needed for border spacing) */
	margin-bottom: 20px;
}

.main1 {
	display: table-cell;
	width: 652px;
	padding: 10px;
	background-color: #efefef;
}

.main2 {
	display: table-cell;
	width: 288px;
	padding: 10px;
	background-color: #efefef;
}

footer {
	padding: 10px;
	background-color: #efefef;
	text-align: center;
}

/* dropdown menu css */

#nav {
    list-style:none;
    font-weight:bold;
    margin-bottom: 10px;
    width:100%;
}

#nav li {
    display: inline-block;
    margin-right:5px;
    position:relative;
}

#nav li ul{
    margin: 0; 
    padding-left: 0;
}

#nav a{
    display:block;
    padding:5px;
    color:#efefef;
    background:#000000;
    text-decoration:none;
}
#nav a:hover{
    color:#fff;
    background:#000000;
    text-decoration:underline;
}

#nav ul{
    background:#fff; 
    background:rgba(255,255,255,0);
    list-style:none;
    position:absolute;
    left:-9999px; 
}
#nav ul li{
	padding-top:2px; 
    float:none;
}
#nav ul a{
    white-space:nowrap; 
}
#nav li:hover ul{ 
    left:0;
}
#nav li:hover a{ 
    background:#000000;
    text-decoration:underline;
}
#nav li:hover ul a{
    text-decoration:none;
}
#nav li:hover ul li a:hover{ 
    background:#222;
}

/* links make-up */

a:link {
	color: black; 
	text-decoration: none;
}

a:visited {
	color:black;
}

a:hover {
	color: #229944;
	text-decoration: underline;
}

a:active {
	color:red;
}

#externallink {
	text-decoration: underline;
}

/* other */

img...