The fast development of information and communication technology has contributed to the development of digital educational content. At the beginning of the paper was given an overview of the introduction of ICT and the development of digital educational content in European countries, Poland and Slovenia, and then in Croatia. As part of the national pilot project „e-Schools: Establishing a System for Developing Digitally Mature Schools (pilot project)“, under jurisdiction of the Ministry of Science and Education, implemented by the Croatian Academic and Research Network - CARNET with partners, Mathematics digital educational contents were developed, for 7th and 8th grades of elementary school and for 1st and 2nd grades of high school. Digital educational content is content for use in education for learning and teaching, which is stored on a computer, electronic media or published on the Internet. Most of the work is devoted to the study of complete digital content created in the pilot project, as well as teacher manuals and teaching scenarios as additional materials. As great care is taken for digital accessibility of digital educational content, the paper describes how accessible is the content to all users. The application of digital educational content in mathematics teaching and the adaptation of the interactive elements is described in more detail through the examples. The end of the paper outlines the future of digital educational content and the planned flow of new content creation.