你好，我正在尝试使用heroku部署我的laravel应用，在完成所有步骤之后，我会收到此错误
Mixed Content: The page at 'managementp.herokuapp.com/' was loaded over HTTPS, but requested an insecure stylesheet 'managementp.herokuapp.com/css/app.css'. This request has been blocked; the content must be served over HTTPS.
请问我该如何解决这个问题！