I hope Vaadin team would provide flexbox layout in 8.2 or 8.x version, that will be a great layout feature.
Couldn’t you do that today with the Vaadin CSSLayout class?
My whole site is based on flexlayout. I have a FlexLayout-class extending CssLayout with some methods for setting direction, flexAlign etc etc. All those methods are doing is adding some styles to the layout and then those styles are configured in my main scss-file. Unfortunately I write everything in scala so nothing to share.