Apart from Color theme and logos, there are several other options to control on your login page
Allow users to create accounts
If this options is enabled - users will be able to create accounts on their own, both from UI and mobile apps. In UI registration button will appear.
If option is disabled - user creation will only be possible from the Admin Panel and by using Admin Panel API
Show mobile apps download button
If this option is enabled - users accessing the web version from the mobile devices will be offered to download the app.
Login page will have an additional button that leads to QR code for app download.