We’ve recently released a simple and easy-to-use plugin for WordPress that allows you to easily add custom CSS (styles) and Javascripts in your pages and posts as well as on a global (sitewide) basis.
Our Custom CSS/JS plugin for WordPress means you don’t have to modify or override templates in your theme any longer. Now you can easily add overriding styles, new styles, and custom Javascript in any page or post or in the entire site.
It’s pretty easy to use. Just download and copy it to your plugins directory, then activate it through the admin and you’re ready to go!