JSFiddle - React, Tailwind, and code Playground

by Chuan Shao

HTML

<div id='top-btn'>
   <a href="..." onclick="...">Back Up</a>
</div>

CSS

#top-btn a {
  position: fixed;
  display: block;
  z-index: 500;
  margin: 0;
  padding: 25px;
  background: red;
  bottom: 0; right: 0;
  transform: rotate(-90deg);
  transform-origin: bottom left;
}

JavaScript

var ele = $('#top-btn a');
ele.css('margin-right', -ele.innerWidth()+'px');