JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper"></div>
<div id="box"></div>

CSS

body {
    height: 2000px;
    width: 100%;
    position: relative;
    top: 0;
    left: 0;
}

#box {
    position: fixed;
    bottom: 10px;
    right: 10px;
    height: 50px;
    width: 50px;
    background: red;
}