JSFiddle - React, Tailwind, and code Playground

HTML

<body >
 
<div id="header">
 
</div>
    
<div id="content">
    <p>Hello world</p>
</div>
</body>

CSS

#header
{
    position:absolute;
    left:0px;
    top:0px;
    height:60px;
    width:100%;
    background-color:rgb(60,125,56);
   
}
#content
{
    position:absolute;
    left:0px;
    bottom:0px;
    top:60px;
    width:100%;
    background-color:rgb(45,45,54);
}