Connection not secure for https://localhost running on wampserver?

Question

I'm a noob for server stuffs and I'm trying for the first time to run https://localhost on wampserver.

Wampserver configuration

wampserver version : 3.0.6
apache version : 2.4.23

I followed all instructions from here.

I did :

1. Add the environment variable OPENSSL_CONF
2. I managed to generate a certificate inside the bin folder and I moved them...
   • path-to-apache/conf/demoCA/certs/cacert.cert
   • path-to-apache/conf/demoCA/certs/cacert.csr
   • path-to-apache/conf/demoCA/private/cacert.pem
   • path-to-apache/conf/demoCA/private/cacert.key

3. And for the moment I desactivate virtualhost menu to include httpd-ssl.conf

   Include conf/extra/httpd-ssl.conf

4. I configured httpd-ssl.conf file

   • DocumentRoot "path-to-wamp64/www"
   • ServerName localhost
   • ServerAdmin admin@localhost
   • CustomLog " path-to-apache/conf/ssl/logs/ssl_request.log"
   • SSLCertificateFile path-to-apache/conf/demoCA/certs/cacert.cert
   • SSLCertificateKeyFile path-to-apache/conf/demoCA/private/cacert.key

5. When I test via the command 'http -t', the synthax is Ok

6. I loaded the following apache modules :
   • socache_shmcb_module
   • ssl_module

And when I test https://localhost or https://localhost:443 or https://localhost/server-status/... My browser says "connection is not secure !"

I don't know what I need to do to debug this. Wampserver does not show me what is wrong. Someone with knowledges could help me ? How can I debug this, which tool for that ?