The admin bar is 46 pixels high when the browser window is up to 762 pixels wide, and 32 pixels high otherwise. WordPress adds “admin-bar” to the <body> tag if the admin bar is present. The exact CSS would depend on how you’ve got the header set up, but that should be enough to let you figure it out.
-
This reply was modified 8 years, 6 months ago by
stephencottontail. Reason: added information about the body tag
So I finally got a chance to look at your site and Adobe Muse really made a mess of things, IMHO. Every single element in your sticky header has to have the top value changed or it doesn’t move with the rest of the header, and I can’t figure out why the white bar behind the header doesn’t move.
My advice would be to see if you can clean it up a bit in Muse, or hiring someone from http://jobs.wordpress.net or a local WordPress meetup or a trusted friend. If you do choose to hire someone, please do not accept any offers that are posted in these forums; that’s not permitted by the forum rules.