Change style background

Change style background for website http://valvrareteam.com/
当前为 2016-09-27 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Change style background
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Change style background for website http://valvrareteam.com/
// @author       Nguyen Huu Tien
// @include      http://valvrareteam.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    jQuery(document).ready(function($){
        var $fbComment = $('.fb-comments');
        
        var handleStyles = {
            black: function() {
                $('.article, .single_post').css({backgroundColor: 'black', color: 'white'});
                $fbComment.find('> span').css({backgroundColor: 'black', color: 'white'});
            },
            white: function() {
                $('.article, .single_post').css({backgroundColor: 'white', color: 'black'});
                $fbComment.find('> span').css({backgroundColor: 'black', color: 'white'});
            },
        };
        var $body = $('body');

        var $controllerContainer = $('<div title="Skin" class="controller-container"><div style="background-color: black;" data-handle-style-name="black" class="styles style-black"></div><div style="background-color: white;" data-handle-style-name="white" class="styles style-white"></div></div>');
        $controllerContainer.css({
            position: 'fixed',
            width: 30,
            right: 5,
            top: 50,
            border: 'black solid 1px',
            zIndex: 1000,
            backgroundColor: '#19B753',
            padding: 2
        });
        var $handleStylesElement = $controllerContainer.find('.styles');
        $handleStylesElement.css({
            width: '100%',
            height: 20,
            cursor: 'pointer'
        });

        $handleStylesElement.on('click', function(){
            var handle = handleStyles[$(this).data('handle-style-name')];
            if(typeof handle === 'function') {
                handle();
            }
        });

        $controllerContainer.appendTo($body);

        handleStyles.white();
        var interval = setInterval(function() {
            var $span = $fbComment.find('> span');
             if($span.length) {
                $span.css({backgroundColor: 'black', color: 'white'});
                 clearInterval(interval);
             }
        }, 100);
    });
})();