Thanks to the author for providing such a beautiful theme.
Below is the issue description:
In edit mode:
In preview mode:
Note line 50, 58 etc, the preview mode displays correctly.
BTW, The obsidian official dark theme displays correctly regardless of preview mode or edit mode.
Code from https://tools.ietf.org/html/rfc793#section-2.5
Thanks to the author for providing such a beautiful theme. Below is the issue description: