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

int buttonState = 0;
void setup() {
 pinMode(red, OUTPUT);
 pinMode(green, OUTPUT);
 pinMode(button, INPUT);
}

void loop() {
buttonState = digitalRead(button);
if (buttonState == 1)
{
  digitalWrite(red, HIGH);
  digitalWrite(green, HIGH);
}
else if(buttonState == 0)
{
digitalWrite(red, LOW);
digitalWrite(green, LOW);
}
}