JSFiddle - React, Tailwind, and code Playground

HTML

<body>
	<div class="wrapper">
	<header></header>
	<nav></nav>
	<aside></aside>
	<main>
		<section class="left_col"></section>
		<section class="right_col"></section>
	</main>
	</div>
</body>

CSS

/* reset browser styles */
html, body, div, span, 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%;
	vertical-align: baseline;
}
article, aside, details, figcaption, figure, main, footer, header, hgroup, menu, nav, section {
	display: block;
}
/* end reset browser styles */

.wrapper {
	width: 1000px;
	margin: 0 auto;
	outline: 1px solid #000;
}

header {
	height: 150px;
	background: #999;
	outline: 1px solid #000;
}

nav {
	height: 100px;
	background: #777;
	outline: 1px solid #000;
}

aside {
	float: left;
	background: #555;
	width: 300px;
	height: 754px;
}

main {
	margin-left: 300px;
	background: black;
	outline: 1px solid #000;
}

main:after {
	content: ".";
	display: block;
	visibility: hidden;
	height: 0;
	clear: both;
}

.left_col {
	width: 290px;
	height: 667px;
	margin: 30px 30px 57px 30px;
	float: left;
	background: red;
}

.right_col {
	height: 667px;
	/*=======first version=======*/
	/*margin: 30px 30px 57px 380px;*/
	/*===========================*/


	/*=====second version====*/
	margin: 30px 30px 57px 30px;
	float: left;
	width: 290px;
	/*======================*/
	background: white;
}