SSL Certificate does't match argbash.io

When I open https://argbash.io/generate with Firefox I receive this error:
Web sites prove their identity via certificates. Firefox does not trust this site because it uses a certificate that is not valid for argbash.io. The certificate is only valid for the following names: cloud.tycak.cz, pg.tycak.cz, tycak.cz

Error code: SSL_ERROR_BAD_CERT_DOMAIN
https://argbash.io/generate

Unable to communicate securely with peer: requested domain name does not match the server's certificate.

HTTP Strict Transport Security: false
HTTP Public Key Pinning: false

Certificate chain:

-----BEGIN CERTIFICATE-----
MIIFMTCCBBmgAwIBAgISA9T/Cgc0Ysz/AKGlHuD79Bq+MA0GCSqGSIb3DQEBCwUA
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
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nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIFYDCCBEigAwIBAgIQQAF3ITfU6UK47naqPGQKtzANBgkqhkiG9w0BAQsFADA/
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-----END CERTIFICATE-----
matejak / argbash

SSL Certificate does't match argbash.io #172
