JSFiddle - React, Tailwind, and code Playground

HTML

<section id="main">
  <div id="some-div"></div>
  <nav></nav>   
</section>

CSS

body{
  height:2000px;
  background-color:red;
}
nav{
  width:100%;
  height:50px;
  background-color:black;
	z-index:1000;
  position:sticky;
  top:0;
}
#main{
  position:relative;
}
#some-div{
  position: relative;
	height:100vh;
	background-size:cover !important;
	overflow:hidden;
}