vaadin-framework/themes/src/main/resources/VAADIN/themes/base/legacy-styles.scss

@import "base.scss";
// For legacy themes; does not wrap styles in .themename
// Creates legacy-styles.css that can be imported into non-sass themes.
// NOTE: can not be used in scenarios where multiple themes are used on the
// same page (e.g portals).
@include base;