WhatsappWeb Dark mode for PC

Set WhatsappWeb Dark mode on.

// ==UserScript==
// @name         WhatsappWeb Dark mode for PC
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Set WhatsappWeb Dark mode on.
// @author       m00n_byt3
// @match        https://web.whatsapp.com/
// @grant        none
// ==/UserScript==

document.body.className = 'web dark';