JSFiddle - React, Tailwind, and code Playground

HTML

<div id="bg"></div>
<div id="wrapper">
    <h1>Hello World</h1>
</div>

CSS

#bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 500px;
    background-color: #08407A;
    z-index: 1;
}

#wrapper {
    position: relative;
    z-index:40}