BuddyPress.org

I’m trying to match the style of the twentyfourteen companion stylesheet on @imath’s awesome wp-ideastream plugin. As you can see here, the activity stream extends the full width of the page: http://thepln.ca/, while the ideastream page is much narrower: http://thepln.ca/ideastream/

I’ve tried messing around with the width:

#wp-idea-stream {
    width: 90%;
    padding: 20px;
}

But that really only gets me partially there. I’m hoping I can ride on the coattails of all of @hnla’s great work to apply the style from templates like activity and members, over to the template for ideastream. Is there a simple way to do this? The ideastream plugin allows you to take a WP template like page.php and rename it ideastream.php, allowing for customization. Could I call a buddypress div id in something like that and magically apply the BP style?

Any direction would be greatly appreciated.