Apologies for this -- I apparently failed to test on dark mode in Firefox. I fixed it up just now (https://github.com/grork/personal-blog/commit/b9df1e924ef2960

Apologies for this -- I apparently failed to test on dark mode in Firefox. I fixed it up just now (https://github.com/grork/personal-blog/commit/b9df1e924ef29606f82e49afe8c3604e4c866b8d https://github.com/grork/personal-blog/commit/b9df1e924ef296...), and should be much more readable.