Answers for "how to change the focus colour of textformfield in flutter"

text fieldform color flutter

TextField(
  style: TextStyle(color: Colors.red),
  decoration: InputDecoration(fillColor: Colors.orange, filled: true),
)

flutter TextFormField background color

TextFormField(
	decoration: InputDecoration(
    	labelText: "Resevior Name",
        fillColor: Colors.white,
        filled: true, // dont forget this line
        ...
    )
    ...
)