smooth and simple abstract line background with attractive color

presentation advertising background attractive gradations abstract document diagram pattern drawing smooth simple circle purple design color brand organ line text font blue pink logo web eye poster color lines technology black texture overview digital wave curve presentation gelombang ilmu gradien konsep ungu kreatif latar belakang ikhtisar kurva abstract graphic design modern geometric background element blue banner gradient wallpaper business website art vector paper futuristic pattern bright concept line template light creative shape backdrop cover diagonal