JSFiddle - React, Tailwind, and code Playground

HTML

<div class="main-bar">
    I am the King!
</div>

<div class="side-bar">
   I am not less!
</div>

CSS

body{
    font-size: 0;
}
.main-bar, .side-bar{
	position: relative;
	margin:0; padding: 0;
	outline: 0;
	display: inline-block;
    font-size: 14px;
	border:none;
    background:#CCC
}
.main-bar{width: 70%}
.side-bar{width: 30%}