BBpress fullwidth template

Hi,

I want to use a full-width template for bbpress instead of the default page template so I did the following steps:
1. Create new file called forums.php in my theme folder.
2. Copy the content from page.php to forum.php
3. Modify it as below.

3.a Change <div id=”primary” class=”hfeed”> into <div id=”primary” class=”hfeed full-width”> (That’s class is what I see in my theme’s full-width template)
3.b Remove <?php get_sidebar(‘page’); ?>

The result I got is that I can get rid of the sidebar (of course), but the width of page is still the same.