You might also want to take a look of this Vaadin theme example that demonstrates that DOM of the Vaadin widgets is optimized for easy CSS: http://demo.vaadin.

You might also want to take a look of this Vaadin theme example that demonstrates that DOM of the Vaadin widgets is optimized for easy CSS: http://demo.vaadin.com/VaadinTunesLayout/ http://demo.vaadin.com/VaadinTunesLayout/