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ShadePrank Gradual Sepia

Shaderoot prank that, after 20 seconds, fades the page to sepia over 1 minute

//
// ==/UserScript==
//
// Written by Glenn Wiking
// Script Version: 1.0.0a
// Date of issue: 09/10/17
// Date of resolution: 09/10/17
//
// ==UserScript==
// @name        ShadePrank Gradual Sepia
// @namespace   SRGS
// @description Shaderoot prank that, after 20 seconds, fades the page to sepia over 1 minute
// @version     1.0.0a
// @icon        https://i.imgur.com/iFR552u.png

// @include     *

// ==/UserScript==

function ShadePrankGS(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) { return; }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

ShadePrankGS (
	'* {filter: sepia(0%); transition: filter 60s ease-in-out 2000ms;}'
	+
	'html:hover > * {filter: sepia(60%) !important; transition: filter 60s ease-in-out 2000ms;}'
);