I have "custom CSS". I had tailored my blog to look identical to my website. Until this morning, all was well. I had not changed the CSS in my WordPress.com blog for quite awhile. (Heck, I hadn't even posted for quite awhile.)
Overnight, my WordPress blog changed appearance, as if a new theme had been installed. The appearance showed the "article" (blog entry) compressed into one third of the display space. A "nav" element appeared atop the "article" linking to a "Home" page. The "#secondary sidebar" at the bottom, with my widgets, compressed to a third of the display space at the right side. (I haven't gone into a Web-inspector sort of service to display the full CSS.)
I tried to re-load my saved CSS, to no avail. Is it possible the theme has been updated or some other change to WordPress has been made? (If not, then I guess I must "View source" and rewrite my CSS from scratch...)
The blog I need help with is pithagora.com.