JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content">sadas asdasd asdsa dsad sa</div>
<div id="mydiv">sadasdsa</div>

CSS

#content {
    top: 0;
    left: 0;
    width: 100%;
    min-height: 543px;
    position: absolute;
    display: block;
    border: 0;    
    overflow: visible;
}

#mydiv {    
    position: fixed;
    height: 150px;
    background-color: red;
    width: 100%;
    bottom: 0px;
}

body {
    position: relative;
}