JSFiddle - React, Tailwind, and code Playground

HTML

<div id="top">a</div>
<div id="middle">b</div>
<div id="bottom">c</div>

CSS

body {
   margin:0;
   padding:0; 
}

#top, #middle, #bottom {
    width:100%;
    position:fixed;
}

#top, #bottom {
    height:100px;
}

#top {
    background-color:red;
}

#middle {
    top:100px;
    bottom:100px;
    background-color:blue;
}

#bottom {
    bottom:0;
    background-color:green;
}