Pop!_Shop category banners are broken when using a non-default GTK3 theme

[bucklingspring]

Distribution: Pop!_OS 19.04

Related Application and/or Package Version: pop-shop 3.0.1~1554755308~19.04~3a86893

Issue/Bug Description: When using a non-default GTK3 theme, the Pop!_Shop category banners are missing backgrounds and appropriate icons.

Steps to reproduce: Change the GNOME application theme from 'Pop' to Adwaita, HighContrast, or any custom theme downloaded from the internet.

Expected behavior: The banners should be identical to the default look across all GNOME application themes.

[mmstick]

GTK themes must support elementary Granite style classes in order to function with the shop.

[cassidyjames]

The color palette is not part of Granite, but is part of the elementary Stylesheet. Technically it has nothing to do with Granite.

[pedrofleck]

Couldn't it fallback to default colours when the theme doesn't provide them? I really like Pop but I wish I could use Adwaita with it

[bucklingspring]

Couldn't it fallback to default colours when the theme doesn't provide them? I really like Pop but I wish I could use Adwaita with it

I agree, this would be very nice.