JSFiddle - React, Tailwind, and code Playground

HTML

<div class="nav-mess">
</div>
<div class='body-mess'>
</div>

CSS

.nav-mess {
	position: relative;
	float: left;
	background: #d9d9d9;
	width: 18%;
    height: 100px;
	border-radius: 0px 0px 0px 10px;
}
.body-mess {
	width: 82%;
	position: relative;
	float: right;
	background: #dfdfdf;
	border-radius: 0 0 10px 10px;
	height: 134px;
	margin-bottom: 100px;
}