Font and font size suddenly changed

After posting my most recent post last night, my font size and style suddenly changed. I’ve checked the CSS, and nothing has changed in that, but what normally appears as a Georgia font, I guess 11 pt., is now probably 8 pt or 9 pt, and my admin/CSS area size is drastically reduced. It’s like everything is at an 80% scale now. I did nothing out of the ordinary as I was posting, so I can’t figure out what went wrong. I’ve checked it on another computer, and it’s doing the same thing. Please help?

https://thelizzypad.com