If you are getting notifications from OfficialDesign, then your Mac is infected with adware. OfficialDesign is adware for Mac.
OfficialDesign changes setting in your Mac. First, OfficialDesign installs a browser extension in your browser. Then, after OfficialDesign hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.