how modify styles shadow root

hello,

I try to align the text of some of my buttons right. But I can not apply my “text align and justify content” in my css since these properties are encapsulated in a shadow root “vaadin-button-container”.
After looking on the internet and in the doc I did not find anything, have you ever been confronted with this problem?

You need to use style/theme modules to apply styles inside the shadow DOM of Vaadin components: https://github.com/vaadin/vaadin-themable-mixin#readme