Customize BI4.1 Logon Screen

Hi All,

We are planning to customize logon screen with different screen, my company follows standard logon screen for all applications, in the same way they want to apply customizations to BI4.1 launchpad, can you please let me where we have apply changes. the basic customization's will not work for my company, I need to change entire logon screen.

Please let me know where exactly I need to change my code.

Thanks,

Mani