Ключевые слова: 23th, abstract, annual, appointment, april, background, banner, black, business, calendar, celebrate, concept, date, day, days, deadline, decoration, design, element, event, flat, greeting, icon, illustration, isolated, meeting, month, monthly, number, number 23, object, page, pattern, pictogram, plan, planner, planning, reminder, schedule, sign, simple, social, spring, symbol, template, text, time, week, year,