With Minerva's dark theme, the share card's light and transparent backgrounds don't seem to display the correct colors:
Based on T421131#11830668 (thanks @Etonkovidova !).
Acceptance criteria
- The share card's light background with Minerva's dark theme has the correct color
-
Share card's transparent background sanity check. Is the current behavior correct?
NOTE: @background-color-base and @background-color-transparent are used as background colors. Perhaps they should be updated.

