JSFiddle - React, Tailwind, and code Playground

HTML

<noscript><style>.overlay{display:none;}</style></noscript>
<div class="overlay">Loading...</div>
<img src="http://lorempizza.com/2000/2000/">

CSS

.overlay{
position:fixed;
top:0;
bottom:0;
left:0;
right:0;
background:#222021;
color:white;
z-index:999;
}

JavaScript

$(window).load(function(){
       $('.overlay').fadeOut();
    });