JSFiddle - React, Tailwind, and code Playground

HTML

<div>BOTTOM</div>

CSS

body, html{
    margin:0;
    padding:0;
}

div{
    position:absolute;
    bottom:0;
    width:100%;
    height:50px;
    background:red;
    text-align:center;
    font-size:40px;
    color:white;
}