JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header">Header</div>
<div id="content">
    Bla
</div>
<div id="footer">sdfasdf</div>

CSS

#header { background-color: gray; padding: 10px;}
#footer { background-color: black; padding: 10px;  color:white; position: absolute; bottom:0; left:0; right: 0;}