JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header">
</div>

CSS

#header{
    position: fixed;
    top: 0;
    width: 998px;
    margin: 0;
    background: url(http://placekitten.com/998/998) no-repeat;
    height:100%;
    left: 50%;
    margin-left: -499px;   
}