Styling an addon

Flow
1

How can you style an addon?? Tried already the code below for the Paginator addon but with no success:

<dom-module id="plutonium-pagination-dom" theme-for="plutonium-pagination">
	<template>
		<style>
			:host{
				display: flex;
				font-size: var(--lumo-font-size-xs);
			}
		</style>
	</template>
</dom-module>
2

It depends on the add-on - each web component can define its own style API (or not define anything). theme-for Theme Modules require that the client-side element class extends Vaadin’s ThemableMixin, so most Web Components probably won’t have that available. Other possibilities are [global stylesheet’s css variables]
(https://polymer-library.polymer-project.org/2.0/docs/devguide/custom-css-properties#create-global-styles) or [css mixins]
(https://polymer-library.polymer-project.org/2.0/docs/devguide/custom-css-properties#use-custom-css-mixins).