The Ozwillo Platform Theme extension provides comprehensive visual integration and user experience design for CKAN portals operating within the Ozwillo European digital platform ecosystem, implementing Ozwillo branding standards, European digital service design patterns, and seamless integration with the broader Ozwillo digital service architecture. This specialized theme incorporates Ozwillo’s visual identity including official colors, logos, typography, and design patterns while maintaining compliance with European accessibility standards and digital service guidelines established for the European digital single market. The extension includes custom page layouts optimized for European digital service integration, specialized templates for Ozwillo ecosystem compatibility, and visual elements that provide consistent user experience across Ozwillo platform services. Advanced features include European localization support for multiple EU languages, integration with Ozwillo navigation and service discovery, and specialized widgets for displaying Ozwillo ecosystem information and cross-platform service links. The theme provides enhanced navigation structures that integrate with Ozwillo’s service portfolio, seamless transitions between CKAN and other Ozwillo services, and consistent European digital service user experience patterns. Customizations include Ozwillo-specific branding elements, integration with European digital identity visual indicators, and mobile-optimized interfaces designed for European digital service accessibility standards. Administrative features provide content management tools compatible with Ozwillo platform requirements, workflow integration with European digital service management systems, and analytics tracking that supports Ozwillo ecosystem monitoring and European digital transformation metrics. Integration capabilities include visual consistency with Ozwillo’s service catalog, European digital service discovery interfaces, and compliance with European digital platform design standards. Essential for organizations participating in the Ozwillo digital ecosystem, European public sector entities implementing digital service integration, academic and research institutions using European federated services, and organizations where visual consistency with European digital platforms, user experience continuity across European services, and compliance with European digital service design standards are critical for effective participation in European digital transformation initiatives and the digital single market.