JSFiddle - React, Tailwind, and code Playground

HTML

<div> <p>BOX</p> </div>    
    
<div> <p>BOX</p> </div>   
    
<footer>
  <p>Position: ABSOLUTE;</p>
</footer>

CSS

div {
  width: 100%;
  height: 400px;
  background-color: green;
}

footer {
    width: 100%;
    position: absolute;
    bottom: 0;
    background-color: #333;
    color: white;
}

p {
  text-align: center;
}

body {
  margin: 0;
}