Styling an addon

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">
				display: flex;
				font-size: var(--lumo-font-size-xs);

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]
( or [css mixins]