Boosts

Boost process works as of 1.124.0 (71787). Arc could change how the boosts function at any time, they update often...

Warning

These boosts are made based on my own tastes first and foremost, and they are by no means "comprehensive". If I see something is wrong or missing from a boost, I add it. If you for some reason use any of these and notice something wrong or missing, you can let me know with an issue or PR.

• Advent of Code
• Claude / Claude (Darker) / Claude (Darkest)
• Codeberg / Codeberg VSCode Syntax / Codeberg Darker / Codeberg Darker VSCode Syntax
• Github / Github (VSCode Syntax)
• Hugging Face
• Reddit

Adding boosts

1. Open Arc
2. Go to corresponding site for the boost you're installing (e.g. claude.ai)
3. Click the Site Control Center button to the right of the URL bar
4. Click New Boost button (the paint brush icon)
5. Click Code button towards the bottom
6. Copy the CSS from the corresponding boost (e.g. claude-neutral)
7. Paste the copied text into the CSS editor

DONE!

Advent of Code

Last updated: 12-05-2025 | aoc

Claude

Claude Neutral removes the green-ish/yellow-ish tint from the original claude.ai UI. Neutral greys only.

Last updated: 02-25-2025 | claude-neutral · claude-neutral-darker · claude-neutral-darkest · claude-neutral-vscode · claude-neutral-darker-vscode · claude-neutral-darkest-vscode

![WARNING] Claude has changed the way the code blocks tokens are rendered, so the VSCode syntax highlighting may not be 100% accurate anymore. It has gotten more complex, and I haven't taken the time to update it with all the new/correct colors.

Codeberg (Gitea theme)

Last updated: 11-29-2025 | codeberg-gitea-neutral · codeberg-gitea-neutral-vscode · codeberg-gitea-neutral-darker · codeberg-gitea-neutral-darker-vscode

Github

I just don't like blue themes. The boost github-neutral-vscode-syntax also implements the syntax highlighting colors from VSCode's default dark theme.

Last updated: 04-11-2025 | github-neutral-default-syntax · github-neutral-vscode-syntax · github-neutral-default-syntax-light

Hugging Face (WIP)

Another Neutral modification, this time changing the Hugging Face blue dark theme to my favorite neutral greys an whites. All icons and accent colors are left unchanged. Not 100% done, some small elements still have blue hover states and stuff. Is mostly neutral though.

Last updated: 08-30-2024 | hugging-face-neutral

Reddit

Last updated: 02-17-2025 | reddit-neutral

License

MIT license