Getting errors adding Buefy to Nuxt - npm

Question

I have a Nuxt project. I've installed Buefy via the steps outlined in the docs. That is:
Run npm i nuxt-buefy
Add 'nuxt-buefy' to modules in nuxt.config.js
I then run the dev server via
npm run dev
...and I get this gumf below. Thing is, Buefy doesn't say anything about having to first add postcss-custom-properties. What am I doing wrong?
ERROR Cannot find module 'postcss-custom-properties' 18:54:24
Require stack:
- C:\Users\mitya\Sync\dev\projects\rpar\node_modules\#nuxt\core\dist\core.js
Require stack:
- node_modules\#nuxt\core\dist\core.js
at Function.Module._resolveFilename (internal/modules/cjs/loader.js:880:15)
at Function.resolve (internal/modules/cjs/helpers.js:94:19)
at m (node_modules\jiti\dist\jiti.js:1:52953)
at Resolver.f [as _require] (node_modules\jiti\dist\jiti.js:1:53766)
at Resolver.requireModule (node_modules\#nuxt\core\dist\core.js:381:29)
at node_modules\#nuxt\webpack\dist\webpack.js:603:58
at Array.map (<anonymous>)
at PostcssConfig$1.loadPlugins (node_modules\#nuxt\webpack\dist\webpack.js:602:10)
at PostcssConfig$1.config (node_modules\#nuxt\webpack\dist\webpack.js:638:14)
at StyleLoader.postcss (node_modules\#nuxt\webpack\dist\webpack.js:909:39)
at StyleLoader.apply (node_modules\#nuxt\webpack\dist\webpack.js:969:12)
at WebpackClientConfig.rules (node_modules\#nuxt\webpack\dist\webpack.js:1357:28)

Answer 1

At the end, scaffolding a brand new Nuxt project was still the easiest to setup Buefy.
Probably that comparing both a new project and an old one and transferring the configuration is the way to go.