Don't show gray background color behind Quick Links images in compact view
Until the latest update to the Quick Links modern web part (early September 2018) that added several new view options, there was no background color behind the image when using the compact view. Previously it was possible to use a transparent PNG image (e.g. for round icon images), but now there is a gray background color behind the image which ruins the effect of the transparency.
This seems to be a side-effect of the new option to use Fabric UI icons. Can you either remove the gray background color if an icon is not being used, or add another option to specify the background color, including none/transparent, so the previous solution of using transparent PNGs can be implemented again?
See before/after pics: https://twitter.com/joshmcrty/status/1040271840160239616