Among the various other features Viber communities allow, one of them is changing the background of the chat, similar to Whatsapp. In case you are a superadmin, you can change the background for all members of the community.
To learn how to customize your background, follow the given instructions:
1. Go to the Community info option.
2. From there, select “Chat background”.
3. You will now be able to choose from any image stored in the gallery, can choose one of your own stored images or even take a new picture with the camera.