Introduction drawer has rounded corner on bottom left side
The following discussion from !105 should be addressed:
- [ ] @sebkur started a [discussion](https://code.briarproject.org/briar/briar-desktop/-/merge_requests/105#note_60704): (+7 comments)
> …although I changed the scrim color to white on the dark theme because the standard `Surface` background color (black for the dark theme) doesn't have any contrast to the rest of the UI if it is overlayed with a transparent black layer. Black looked good for the light theme though, so I tried using inverted colors for the dark theme.
issue