Your web browser should complain that the website's owner cannot be verified. This is a security measure for SSL related to the certificate. Because we made the certificate ourselves, the browser doesn't know whether to trust the certificate, because there is no signing authority.
You can safely click ~Advanced~ and add the certificate as trustworthy, because you've signed the certificate and trust yourself :).
If you want to get rid of this, you'll need to get a signing authority like ~LetsEncrypt~ to generate your certificate.