JSFiddle - React, Tailwind, and code Playground

by each

CSS

#wrapper {
    background: none;    
}

#bg {
    background: url(bg.jpg);
    position: fixed;
    top: 0; right: 0;
    left: 0; bottom: 0;
    z-index: 1;
}

JavaScript

$(window).load(function() {
   
   $('#bg').fadeIn(500); 
    
});