JSFiddle - React, Tailwind, and code Playground

by Anton Ayupov

HTML

<div class="header">
</div>
<div class="content clearfix">
    <div class="aside-column">
        <div class="aside-column-inner">
        </div>
    </div>
    <div class="main-column">
    </div>
</div>

CSS

.clearfix:before,
.clearfix:after {
	content: " ";
	display: table;
}

.clearfix:after {
	clear: both;
}

.header {
    height: 100px;
    background-color: yellow;
}

.aside-column {
    float: left;
    width: 100%;
}

.aside-column-inner {
    margin-left: 300px;
    background: green;
    height: 200px;
}

.main-column {
    float: left;
    width: 300px;
    margin-left: -100%;
    background: black;
    height: 200px;
}