int led1 = 12;
int led2 = 13;
int button = 11;
int buttonState = 0;

void setup() {
  // put your setup code here, to run once:
    pinMode(led1, OUTPUT);
    pinMode(led2, OUTPUT);
    pinMode(button, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
    buttonState = digitalRead(button);
    if(buttonState==1)
    {
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      delay(3000);
    }  
    else if(buttonState==0)
    {
      digitalWrite(led1, LOW);
      digitalWrite(led2, LOW);
    }
}