Each organisation can have a default splash background.
To set the default organisation splash background
...
Upload the required image. The image type must be set to "Splash and emergencies".
Under the "Organisation" link in Vivi Central, select the "Splashes" link.
The screen will show if a custom splash has been set. The organisation wide splash will have a "Type" of "Organisation".
If a default has not already been set, click "Assign Splash".
If required, set the organisation that the splash applies to.
Set the "Type" to "Organisation-Wide Default".
Click "Choose Existing" to choose the splash image from the media library.
Click "Assign Splash" to save changes.
If an existing default splash exists, you will need to edit it instead.
Click on the name of the image. This will be in the "Assignment" column.
Click "Edit".
Click "Choose Existing" to choose the splash image from the media library.
Click "Save Changes".
To remove the default organisation splash background
...
Under the "Organisation" link in Vivi Central, select the "Splashes" link.
The screen will show if a custom splash has been set. The "Type" of splash will be shown as "Organisation".
Click "Unassign" to remove it as the default splash screen. The image will still remain in the media library.