JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.githubusercontent.com/Mango/slideout/master/dist/slideout.min.js"></script>
<body>
<nav id="menu">
		<header>
			<h2>Menu</h2>
		</header>
	</nav>

	<main id="panel">
		<header>
			<h2>Panel</h2>
		</header>
	</main>
  </body>

CSS

body {
  width: 100%;
  height: 100%;
}

.slideout-menu {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  right: 0;
  z-index: 0;
  width: 256px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  display: none;
}

.slideout-panel {
  position: relative;
  z-index: 1;
}

.slideout-open,
.slideout-open body,
.slideout-open .slideout-panel {
  overflow: hidden;
}

.slideout-open .slideout-menu {
  display: block;
}

JavaScript

var slideout = new Slideout({
		'panel': document.getElementById('panel'),
		'menu': document.getElementById('menu'),
		'padding': 256,
		'tolerance': 70
	  });