int red = 13;
int blue = 12;
int btn = 11;

int buttonState = 0;

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

void loop() {
  // put your main code here, to run repeatedly:
  buttonState = digitalRead(btn);

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

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