JSFiddle - React, Tailwind, and code Playground

by Dmitry Fateev

HTML

<div class="main">
  <div class="box"></div>
</div>

CSS

.main {
  height: 600px;
  position: relative;
}

.box {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 40px;
  background-color: #202020;
}