Just like consoles and PCs, every mobile device has different graphical limitations. (allgamers.com)
The whole look of Mario came about through creative design in the face of graphical limitations of the hardware at the time. (cultureofgaming.com)
On a similar note, her dress had always been depicted as pink in video game artwork, although because of the aforementioned graphical limitations of the NES hardware, her on - screen sprite in the Super Mario Bros and The Lost Levels depicted her as wearing a white dress with red highlights, with her only gaining a pink dress starting with the overseas version of Super Mario Bros 2. (mariowiki.com)