The site looks good. I would perhaps lighten the background a tiny bit...just so black lines elsewhere show up some. But thats personal preference.
Thanks. I discovered this morning that I hadn't changed to path for the corner logo. While playing with it last night I was using http://localhost
... so it worked fine on one computer, but of course the logo wouldn't appear when viewed from any othe computer. Fortunately that was a minor issue.
Thanks for the suggestion on the background color too. I'm still tweaking colors a bit, so will consider your suggestion. Since much of my site is related to astronomy I was looking for a dark theme to mimic the night sky... but I'll play around with it a bit.