Ключевые слова: app, application, art, background, book, booking, business, buy, cinema, concept, contour, coupon, design, device, flat, flight, icon, illustration, internet, isolated, line, linear, lineart, mobile, modern, online, order, outline, pattern, pay, phone, plane, purchase, random, screen, seamless, service, sign, smartphone, symbol, technology, ticket, train, travel, trip, web,