My adaptation of stysebae's "joplin-vsc-material-theme". Some of the main things were to ...
- Make written markdown look much like rendered markdown, and thereby reduce the need to switch between views.
- Soften the colors
- Draw attention toward the editor and rendered text, by making the rest less visually intrusive
Make sure you have Fira Sans and Consalas installed. Set them as your editor and code fonts in Joplin, and select dark mode.
Additions not in screenshot: