Kentico CMS, it comes with a default login page for each web template. However one can create a new custom page for login purpose and set it as the default login page for the Kentico enabled website.
Following are the steps to set the custom Login page as default login page
->First sign in to the CMS Site Manager as global administrator.
->Then go to Settings Tab.
->Choose website from the dropdown list as Site(at the top left side corner of window).
->Then expand Settings and choose Security & Membership tab.
->Then the Security & Membership windows will open on the right side.
->At the Content tab, set the path of the custom Login page to the Website logon page URL and save it.
Now you will get the customized Login page as default login page.