JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
   <div class="navbar">Navbar</div>
   <div class="body">Body</div>
</div>

CSS

.navbar {
    background-color: green;
    -webkit-box-shadow: 0px 2px 16px 2px rgba(0,0,0,0.75);
    -moz-box-shadow: 0px 2px 16px 2px rgba(0,0,0,0.75);
    box-shadow: 0px 2px 16px 2px rgba(0,0,0,0.75);
    position: relative;
    z-index: 10;
}

.body {
    position: relative;
    z-index: 0;
    background-color: white;
}