Designed for an older version of VaadinThe theme editor was designed for Vaadin 10, and hasn’t yet been updated to support later versions out of the box. The resulting CSS is still usable as-is in all versions.
Instead of HTML imports and
<custom-style>, which were used in earlier Vaadin versions, you should place the CSS in your custom theme’s document root style sheet. For example,
The CSS inside the
<dom-module> elements (in the editor’s output) should be placed in the corresponding component style sheets in your custom theme.
The theme editor isn’t an officially supported tool, but you can still report any issues and feature requests through the Vaadin Discord chat.