int yellow = 12;
int green = 11;
int button = 10;

int buttonState = 0;

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

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

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

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