What should the file have been detected as? What has the file been misdetected as?

Python implementation:
(filedetect) agresor@darkstar:~$ magika -s /usr/share/doc/libexpat1-dev/expat.html/style.css
/usr/share/doc/libexpat1-dev/expat.html/style.css: C source (code) 90%

Web demo implementation:

Please link or attach the misdetected file below (Do NOT upload PII!)
style.css.gz

Additional context
Seems like different implementation of the same model have different detections.