dcat-8.x-1.x-dev/dcat_landingpage/dcat_landingpage.services.yml

services:
  theme.negotiator.dcat_landingpage_theme_negotiator:
    class: Drupal\dcat_landingpage\Theme\LandingpageThemeNegotiator
    tags:
      - { name: theme_negotiator, priority: 10 }