int red = 13;
int green = 12;
int button= 11;

int buttonState = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(red, OUTPUT);
pinMode(green, OUTPUT);
pinMode(button,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

buttonState = digitalRead(button);

   if (buttonState ==  1)
   {
   digitalWrite(red, HIGH);
   digitalWrite(green, HIGH);
   }

   else if (buttonState == 0)
  {
  digitalWrite(red, LOW);
  digitalWrite(green, LOW);
  }
}