Yes. To choose a background image for the viewer, go to the Publications page of your account.
Select a publication and click on the Pencil icon.
Under the Design tab, choose a background from the drop-down menu beneath Select a background.
If you are a PREMIUM user, you can add your own background image by clicking the link to enter a URL.
In the field that opens, enter a valid, secure URL (starting with https://) where your background image file is hosted.
If you are already using a custom background image on another publication, this background will automatically appear in the list of options in the drop-down menu.
PLATINUM users may upload up to 3 background images to the Elements section of their accounts.
Once a background has been uploaded to your account, it will automatically appear as an option in the Select a background drop-down menu.
If you are a PLATINUM user, you may add your background to multiple publications simultaneously.
You can update or delete customization elements at any time.