Ключевые слова: accept, approval, approved, background, business, check, checkmark, communication, computer, confirm, confirmation, correspondence, cross, delivery, design, document, email, envelope, flat, graphic, green, icon, illustration, internet, isolated, letter, line, mail, mark, message, notification, object, open, post, receive, rejected, send, sign, subscribe, subscription, success, symbol, tick, verification, verify, web, website, white,