I'm trying to modify the CSS in the Gutenberg module to change the editor layout. Gutenberg uses SASS files to generate the CSS.
I tried editing the CSS files directly, which I recognize I shouldn't do with generated code. This ended up having no effect on the module's output, and the old CSS is somehow cached despite clearing all caches. I also tried instead modifying the SASS directly, but I don't know how to trigger a re-compile. I suspect the CSS is distributed pre-compiled.
What can I do to properly modify and update the SASS/generated/cached CSS?