Hi, I am a professional SqareSpace developer and I can help you to add your CSS to your template. Adding extra script to SQUARESPACE is quite challenging. But for a professional it can be done within minutes. I am ready to work with you. I can start it now and will finish within few minutes. Let me know I am waiting for your reply.
Thanks and Best Regards,
Imalak
https://www.freelancer.com/u/gurudave