CSS styles are lost in production mode

[ghost]

Hello!
I have the following problem: in production mode css styles are not applied. In development mode everything is ok.
I guess it happens because of Purgecss plugin, which we have only on production. I tried adding some daterange-picker classes to whitelistPatterns, but it didn't help.

Here is how daterange-picker looks on prod:

Here is my styles import (as described in the docs)

Here is postcss.config

[d0hn]

Have you tried to use safelisting in the actual css/scss?
Like so:

/* purgecss start ignore */
@import "~vue2-daterange-picker/dist/vue2-daterange-picker.css";
/* purgecss end ignore */