how to change the security login page UI in Open Data?

[Prasanna14]

i have open data arcgis hub site application, that application security level is private. whenever some one open that url that is asking login, in that page how can i change the UI screen? is there any possibilty? bellow is the UI Screen... anyone pls help me. 

[Anonymous User]

this currently is not an option in Hub. we'll take this down for consideration!

[Prasanna14]

Thank You Graham Hudgins