The webpack build is generating this warning:

WARNING in asset size limit: The following asset(s) exceed the recommended size limit (244 KiB).
This can impact web performance.
Assets:
./campaigns.min.css (416 KiB)

This is probably due to the complexity of the campaigns SCSS files, and the scoping and inheritance in place. So it would be best to split the campaigns CSS into themes, and enqueue the styles in PHP at render time for each specific theme as needed.