Sorry to hear about the inconvenience. Kindly, please share your Site WP-ADMIN Login details in the Private Content field so that we can check this concern on your Site and help you out accordingly.
Sorry to say that your given login details are not working, please share the correct login details of your site. So I will further check on your site and solve the issue on your site.
Your issue has been resolved. You have missed the dot in the custom css. I have modified the code and it is working fine. Check back your site and check the issue.