I don't like Twitter's background.
// ==UserScript==
// @name Twitter Night Mode
// @namespace https://juanjosalvador.me
// @version 0.1
// @description I don't like Twitter's background.
// @author Juan José Salvador Piedra
// @match https://*.twitter.com/*
// @require http://code.jquery.com/jquery-latest.js
// @grant none
// ==/UserScript==
$(document).ready(function() {
var dark = "#444";
// add your custom colors here
$('body').css("background-color", dark);
// add your custom elements here
});