Setting appBarColor does not work in some pages

[crablet]

When I set the appBarColor to 'const Color(0xffffecb3)' and this is what I expect(pic0).
pic0: https://ibb.co/qrjbMdW
(BTW: There is an overflow occurs on the check button.)

But in some pages, the colour of the top bar still remains black while some buttons are black too(pic1, pic2, pic3), so I can't figure out buttons from it.
pic1: https://ibb.co/NZb2wBx
pic2: https://ibb.co/FBFGTQZ
pic3: https://ibb.co/6XgVvQw

My code:
ImageEditor(appBarColor: const Color(0xffffecb3), image: mergedImage)

Thanks for your excellent work of this useful library. It really helps me a lot!

[hsbijarniya]

Updated the library to use ThemeData

Use

ImageEditor.theme = ThemeData(
...
);

To customize UI accordingly.