Ключевые слова: app, book exchange, book swapping, business, certificate, computer, copy space, design, diploma, ebook, education, elearning, element, flat, icon, illustration, information, knowledge, layout, lesson, line art, menu, mobile, onboarding, online, pictogram, research, school, science, screen, seminar, student, studying, symbol, technology, template, thin, training, ui, university, user, ux, vector, walkthrough, web, web banner, webinar, website, welcome, white background,