Customize the default templates and apply our custom branding including Web UI

Greetings team,
This is Abdullah here from Blind Help Project (BHP). We are a non profit organization which aims to empower the visually impaired community around the globe.
We needed a password manager, then after the research, we chosen Vaultwarden as our Password manager.
Now, we are looking to apply our custom branding in emails and web UI.
Would you plese help us in this?
This is something new for us. but we can do this with your help.
Thanks in advance.