http://demo.vaadin.com/valo-theme/

Flow
1

http://demo.vaadin.com/valo-theme/

is a great demo.

Is there source to this so I can see how it’s done?

2

For source code: https://github.com/vaadin/vaadin/tree/master/uitest/src/com/vaadin/tests/themes/valo

and for theme example implementations at:
https://github.com/vaadin/vaadin/tree/master/WebContent/VAADIN/themes/tests-valo

3

There’s a version of the project in Vaadin core repository but it’s mainly for testing purposes. Official dedicated repository for the demo can be found at
https://github.com/vaadin/valo-demo