Problem with contact form and google font in http

hello, I’ve entered a contact form on a page in a private area.

At the time of sending, the form does not send the mail and in the console I have the following message:

“Mixed Content: The page at ‘https://www.beatricemazza.it/my-account/?profile=post&id=4293’ was uploaded over HTTPS, but requested an insecure stylesheet ‘http://fonts.googleapis.com/ css? family = Side: 300,400,700 ‘. This request has been blocked; the content must be served over HTTPS. “

How can I fix it and make sure that the contact module works properly?

Thanks in advance