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);
}
}