Help needed applying styles in litelements

[rvt]

Hey All,

I am using picocss latest + parcel + sass. This works fine but I want to further create a single page application that needs to run on a microcontroller. So for me size matters.
The idea is to use lit-elements, however when I add a component to my page non of the lit-html elements are styled.

How do I apply picocss styles to lit-html components? What is the correct approach to this?

[rvt]

I will just use this:
createRenderRoot() { return this; }