NDLA Virtual Tour (360) static image dimensions

Hi all

Does anyone have any advice for image dimensions when using a static image as the background for a scene? My escape room is comic-themed and so my static images have white borders around them, which unfortunately makes it hard to miss the black lines on the left and right sides of the image (sometimes one side, sometimes both).

For example, the image I've just added (attached) is 1920px x 1082px and it displays with a one or two pixel line down both sides. I've tried adjusting the height of the image to 1080, 1081, 1083, and 1084, but all options display one or both of these lines. 

Any advice would be appreciated.

Thanks in advance!