JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
 <meta content="text/html; charset=ISO-8859-1"
 http-equiv="content-type">
 <title>blah</title>
 
</head>
<body>
<img id="background" src="http://dummyimage.com/600x400/000/fff" alt="Background Image" />



</body>
</html>

CSS

html, body{
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    overflow: hidden;
}
img#background {     
    position: absolute;     
    top: 0;     
    left: 0;     
    width: 100%    ; 
    height: 100%; 
    margin:0;
    padding:0;
}