Looking for logging into the Salesforce Customer Page site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Salesforce Customer Page site. After that you can login as usual with your login credentials.
https://login.salesforce.com/?locale=de
https://help.salesforce.com/apex/HTViewHelpDoc?id=domain_name_login_branding.htm
https://developer.salesforce.com/docs/atlas.en-us.externalidentityImplGuide.meta/externalidentityImplGuide/external_identity_custom_login_page_about.htm
https://help.salesforce.com/apex/HTViewHelpDoc?id=networks_customize_login_page.htm
https://help.salesforce.com/apex/HTViewHelpDoc?id=trialforce_creating_branded_login.htm
https://developer.salesforce.com/forums/?id=906F00000008kdTIAQ
https://success.salesforce.com/answers?id=90630000000h5FCAAY
https://help.salesforce.com/articleView?id=domain_name_login_branding.htm&type=0
https://help.salesforce.com/apex/HTViewHelpDoc?id=networks_customize_login.htm
https://developer.salesforce.com/docs/atlas.en-us.externalidentityImplGuide.meta/externalidentityImplGuide/external_identity_login_intro.htm
https://trailhead.salesforce.com/en/content/learn/modules/identity_login/identity_login_my_domain
https://developer.salesforce.com/docs/atlas.en-us.externalidentityImplGuide.meta/externalidentityImplGuide/external_identity_custom_login_page_login.htm
https://help.salesforce.com/apex/HTViewHelpDoc?id=security_login_flow_create.htm