import com.vaadin.flow.component.button.Button; import com.vaadin.flow.component.button.ButtonVariant; import com.vaadin.flow.component.orderedlayout.VerticalLayout; import com.vaadin.flow.router.Route; @Route("") public class MyButtonView extends VerticalLayout { public MyButtonView() { button.addThemeVariants(ButtonVariant.LUMO_PRIMARY); button.addClickListener(event -> { }); add(button); } }