bbPress.org

I have a child theme created and added the bbpress.css from my main theme’s css folder to the child theme folder. Changes I make to the child theme do not have any effect and firebug shows that the bbpress.css in the main theme’s css folder is the one affecting the website. I can make changes using the custom css area but was trying to make all changes in the child theme. Any thoughts why this may be happening?

Thanks
Sue