DART

flutter color

Colors.white
Color(0xffA5A4A4)
Color(0xffA5A4A4).withOpacity(.5)
Color.fromRGBO(38, 38, 38, 0.4)
Color.fromARGB(255, 66, 165, 245);
Color.fromARGB(0xFF, 0x42, 0xA5, 0xF5);

flutter color

AnimatedContainer(
          width: MediaQuery.of(context).size.width, 
          alignment: Alignment.bottomCenter,
          height: MediaQuery.of(context).size.height,
          duration: Duration(milliseconds: 100),
          padding: EdgeInsets.fromLTRB(15, 10, 15, 5),
          color: Colors.blue, 						//change to any preset color(ctrl + space)
         
        ),

flutter colors

Color selection = Colors.green[400]!; // Selects a mid-range green.