If you are missing this feature open an issue about it.
The following page isn't customizable yet.
It's however planned to enable this. Follow the progress in this issue.
Keycloakify lets you bundle an email theme in your Jar but you'll have to use FreeMarker for customizing your email template.
Hence the default look might seems a bit dated:
Learn more about why we made this choice in the june 2024 update of this discussion message.