Hello @mgz069,
Alright, I some CSS has an error on your website.
The CSS is correct, but since you have more custom CSS on custom CSS it has some syntax errors; For troubleshooting, please do the following steps and let me know the results:
1- Remove all customization CSS(usually in customizer > custom code > css).
2- add your customization one by one.
3- After adding each customization code, check your issue.
Note 1: in the staging website, if you have a cache plugin or server cache. You need to clear its cache contents or disable them.
Note 2: Please get a full backup from your website before it.
Note 3: You can use CSS checker online tools to find the error faster.
Best Regards