JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bg"></div>

CSS

.bg {
    background-image:url('http://i1.ytimg.com/vi/XWGszmviDpA/maxresdefault.jpg');
    background-position:center;
    background-size: auto 100%;
    background-repeat: no-repeat;
    width: auto;
    height: 100%;
    position: fixed;
    left:0;
    right:0;
    margin:0 auto;
}