Hi @ibrahim.a
Welcome to the Auth0 Community!
Unfortunately, there is no out-of-the-box solution regarding implementing a White-Label-Authentication for your users using Auth0 since that level of branding is tenant-wide. That means you would need a multi-tenant environment to handle such a feature. As far as I am concerned, in order for you to accomplish this use case, you would need to be under an Enterprise plan since an Essentials or Professional plan are quite limited. Otherwise, you would need to come up with your own implementation in order to achieve this however you might reach certain limitations or problems.
If you want to know more about a multi-tenant approach, I would advise you to review this community post regarding the matter: Whitelabel within multi tenancy
You can also read more about Embedded login here: Centralized Universal Login vs. Embedded Login
I would highly recommend to submit a product feedback regarding this since it sounds like a great idea in order to have this item on our roadmap.
If you have any other questions, feel free to let me know!
Kind Regards,
Nik