Plugin works for 'serve' but now for production 'build'

[LaurensVijnck]

Hi,

I'm using this plugin for production-ready Vue application. I'm attempting to deploy the app through a simple docker container. For some reason, the element-ui components are not loading properly anymore. For the normal, 'serve' script, it works as intended.

Screenshots below show whats messed up, it should look as follows:

But the page is displayed like this:

Any ideas on what causes this?