JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="header">
</div>

<div class="player-header">
</div>
</body>

CSS

body {margin:0;padding:0;background-color:#cecece;min-height:1000px;}

.header {
  width:100%;
  height:70px;
	position: fixed;
  z-index:999;
  background-color: #fff;
}

.player-header {
  width:100%;
  height:70px;
	position: fixed;
  z-index:999;
  background-color: #000;
}