Access CSS values with jQuery when scraped with node.js

I am scraping a page using node.js (basically), then jQuerify the result in order to access the CSS values for some elements. However, for some reason, .css("something") always returns an empty value. E.g. .text(), however, is working fine. Any hints? Do I need to output the scraped page first before I can access the CSS?

var request = require('request');
var jsdom = require('jsdom');

var req_url = 'URL';

request({uri: req_url}, function(error, response, html){
    if(!error && response.statusCode == 200){
        var window = jsdom.jsdom(html).createWindow();
        jsdom.jQueryify(window, 'http://code.jquery.com/jquery-1.4.2.min.js', function() {
            var bg = window.$("#ID").css("color");
            console.log(bg);
        });
    }
});