JSFiddle - React, Tailwind, and code Playground

HTML

<div id="flashBitches"></div>

CSS

#flashBitches { 
    width: 100%;
    height: 1200px;
    overflow: hidden;
    background: #000;
    opacity: .5;
    position: absolute;
    top: 0px;
    left: 0px;
    z-index: 99;
}

JavaScript

$(function() {


    function flashMe() {
        var hue = 'rgb(' + (Math.floor(Math.random() * 256)) + ',' + (Math.floor(Math.random() * 256)) + ',' + (Math.floor(Math.random() * 256)) + ')';

        setTimeout(function() {

            $("#flashBitches").css({
                'background': hue
            });

        }, 20);

        setTimeout(function() {

           // flashMe();

        }, 20);


    }

    flashMe();

});