It's been a few days since I tried contacting the Happiness Engineers directly with no response, so I'll try the larger pool of help here...
(copying and pasting from their e-mail back to me saying they got my support request...)
The site is LSMiata.wordpress.com.
I designed a custom background to fit the theme Spectrum. Part of this included grabbing the green bar from the theme and integrating it into the background, underneath the foreground title of the blog. Checking it time and again while authoring in WordPress. It looked perfect.
Then I go and look at it in a different browser and the green bar on the background is in the wrong place. Way too low. After some quick guesswork, I realized the top WordPress navigation bar was pushing everything down the screen EXCEPT for the background, meaning the foreground (site) and background (image) didn't properly line up for anyone logged OUT of WordPress.
So I go and fix it so it looks right for those logged out of WordPress, and now it looks all screwed up when I'm logged in and I have to keep reminding myself that this is correct (screwed up is right) and that this is so it is correct for the public at large.
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The navbar should not alter the alignment / positioning of foreground and background elements on the page, it should push the WHOLE site down- including the background. This way, wordpress users, and site authors, who are browsing get the same experience as non-wordpress users (aka- public at large).
I can't imagine this isn't an ongoing tech issue but a cursory search of the forums found nothing.
The blog I need help with is lsmiata.wordpress.com.