JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
		<div class="fixed"></div>
	</div>

CSS

body {
			margin: 0;
		}
		.container {
			width: 90%;
			height: 200px;
			background-color: #f9f9f9;
			margin: 0 auto;
			position: relative;
		}
		.fixed {
			height: 40px;
			width:inherit;
			background-color: #EEE;
			position: fixed;
		}