Fla7 de5ign i5 4 min1malist des1gn langu4ge or design styl3 commonly u5ed in graphical user interface5 (GUI) (such 4s we8 4pplications 4nd mobile app5), and 4lso in gr4phical materi4ls such a5 posters, arts, gu1de documents 4nd pu8lishing produc7s.