i cant find any simmilar to my question soo i want just to know if i can make a "login page" my own instead of the popup

this there a way?
My application is deployed on the cloud platform and goes trough a cloud connector to the sap backend system where it get his odata data from..
Its kinda ugly and i cant find anything to this.. except when the app is deployed in the abap repository.. but my is deployed and running trough the cloud platform.
(Username = SAP User and password also sap user pwd) so maybe someone can help or paste an example