GitHub Dark Dimmed

Installation

1. Switch to the Dark color scheme in Settings → Appearance → Base Color Scheme
2. Copy github-dark-dimmed.css into your vault: <vault>/.obsidian/snippets/
3. Enable it in Settings → Appearance → CSS snippets

Dynalist's Sepia

Installation

1. Switch to the Light color scheme in Settings → Appearance → Base Color Scheme
2. Install Border Theme and choose it in Settings → Appearance → Theme
3. Install Style Settings plugin and enable it
4. Open Settings → Style Settings → Import and copy contents of dynalist-sepia.json to appeared window, press Save