JSFiddle - React, Tailwind, and code Playground

HTML

<div id="qwe"><img src="http://2.bp.blogspot.com/_r_rtt8KUl7Y/S_dqmVUf7dI/AAAAAAAAAZs/3GCVpgXqjw8/s1600/cool-cat.jpg"></div>

CSS

#qwe{
    width: 100%;
    height: 100%;
    background-color: red;
    position: fixed;
}

#qwe img {
    width: 100%;
}