JSFiddle - React, Tailwind, and code Playground

HTML

<div id='wrapper'>
    <!--content-->
</div>

CSS

html,body {
  height:100%;
}
body {
  min-height: 100%;
}
#wrapper {
    background: url("http://placehold.it/350x150") no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
    height:100%;
    display:none;
    background-attachment: fixed;
}

JavaScript

$(document).ready(function() {
    $('#wrapper').fadeIn(1000);
});