JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header"></div>
<div id="body"></div>
<div id="footer"></div>

CSS

#header {
    height:50px;
    width: 100%;
    background: black;
    position: fixed;
    top: 0;
}

#body {
    height:100%;
    width: 100%;
    background: #CCC;
    position: absolute;
    margin: 50px 0 0 0;
}

#footer {
    height: 50px;
    width: 100%;
    background: #0CF;
    position: fixed;
    bottom: 0;
}