Ключевые слова: 23 april, art, background, banner, book, card, celebration, college, colorful, concept, cover, day, design, education, educational, flat, graphic, happy, holiday, illustration, information, international, knowledge, learn, library, literacy, literature, open, page, paper, pile, poster, read, school, science, story, student, study, studying, template, textbook, university, world, world book day,