JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id="background" style="display:none">
        &nbsp;
    </div>

    <div id="inhoud">
        Ik mag netsplitter niet zo, gr gr           
    </div>
</body>

CSS

#background {
    width: 100%;
    height: 100%; 
    z-index: 10;
    top: 0; 
    left: 0; 
    position: fixed; 
    background: url('http://www.kingdomi.com/images/graphics/nature/nature6.jpg');
}

#inhoud { 
    width: 100%;
    height: 100%; 
    z-index: 100;
    top: 0; 
    left: 0; 
    position: fixed; 
}

JavaScript

$(document).ready(function(){
    $('#background').fadeIn('slow');
});