Hey Paul,
Good catch! While I did just now fix that error you pointed out, I actually resolved the issue moments before that. The reason I kept receiving the CSS Parse Error despite me fixing the css errors was because of some browser caching shenanigans on my end. Once I cleared that, the error disappeared.
For anyone curious, just follow the steps outlined here...
https://support.squarespace.com/hc/en-us/articles/115004581087?_ga=2.247538053.348732043.1669656977-393211385.1669656974
and here...
https://support.squarespace.com/hc/en-us/articles/205815408-Clearing-your-browser-s-cache
Thanks for the help!