[SOLVED] Limiting menu background to menu items

Hello,

When using the centered menus, %page-center and %cat-center, the menu background is limited to the menu items, and doesn't extend beyond them (I am not using the background image for infinite extension on the left and right of menus by the way).

I would like to get the same behaviour with a %cat-right menu. In other words I would like that the cat menu background color doesn't appear on the far left of the right-aligned menu if menu options don't fill the whole page width.

Is it possible? Any input appreciated.