Polymer @import theme file with :host in styles has no affect

Question

Back with another Polymer question, I have a Polymer/Electron app that I\'m trying to style.

I want to create a theme.css that contains a :host

Answer 1

Using dom-module concept, and in order to use a external third party I did the next and it is working, but probably is not a Polymer best practice.

Dom module with 3rd party css (third-party-styles.html)

I created a container (elements.html) where import all needed html modules, and there I registered the third party style module and my module

And I added the elements.html in the head of my index.html

    ...
    


    

In my Polymer Element (my-module.html)

any feedback?