Unable to download other themes

[wwwAngHua]

Describe the bug

I'm trying to use other themes besides the onDark theme, but surprisingly none of them can be downloaded!

Reproduction

npm install @codemirror/theme-smoothy

System Info

npm ERR! code E404
npm ERR! 404 Not Found - GET https://registry.npmjs.org/@codemirror%2ftheme-smoothy - Not found
npm ERR! 404 
npm ERR! 404  '@codemirror/theme-smoothy@*' is not in this registry.
npm ERR! 404 
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.

Used Package Manager

npm

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