Https Validation / Mixed Content from CSS

Hi, i think a lot of webmaster actualy move to https – anyone solve the “Mixed Content” Problem – http elements on https sites

I think some of the requests come from the css

samples
https://fonts.googleapis.com/css?family=Open+Sans:400,700
loaded over HTTPS, but requested an insecure stylesheet ‘https://fonts.googleapis.com/css?family=Open+Sans:400,700’. This request has been blocked; the content must be served over HTTPS.

Failed to decode downloaded font: https://fonts.gstatic.com/stats/Roboto/normal/500

At which point we can change the path of this files?