This is the quick way to patch this. I'd recommend changing the findFirstFile function in functions/__init__.py for a more permanent solution, but this should suffice for now.
Windows path to the image has '\' path separator instead of '/' which makes
the stylesheet fail. Background images don't appear and console gets spammed with :
Could not parse stylesheet of object corkView(0x27248eb6900, name = "corkView")
See issue #52.
Enable selection of background color in addition to background image
for index cards. This setting is accessed from the manuskript menu
**Edit -> Settings -> Views -> Index cards**.
Keep initial default of "writingdesk" background image for Index cards.
Also update comments for functions to better describe how these work.