I have created a survey using Survey 123 Connect on my desktop. Currently, under Settings-->Style-->Background Image, I have picked an image (wood grain) that successfully appears in the preview pane of the Survey 123 Connect interface. Once the survey is published, I can download and run the app on my phone and the background image displays properly within the survey. Upon opening the survey on my desktop computer in my web browser (Edge or Chrome), the 'Background Image' does not display. Once you start to scroll the survey page, a tiny portion of the background image will show at the very top of the survey. Any ideas? Does the image need to be a certain size? The current image being used for the 'Background Image' is 640 x 480 pixels @ 72 dpi.
As supporting information, I have published the survey several times with the following settings: default background color assigned in Survey 123 Connect, white, and I have tried a brown shade. Results in the web application respond to this setting; each time I changed the 'Background Color' setting and then published the survey, the web version of the survey displayed the selected color, but not the image.