void setup() {
  pinMode(13, OUTPUT);             // declare pin 13 (BLUE LED) as output
  pinMode(7, OUTPUT);             // declare pin 7 (yellow LED) as output
  pinMode(12, INPUT);             // NIGHT BUTTON
  pinMode(6, INPUT);              // DAY BUTTON
}
void loop() {
  if (digitalRead(12) == HIGH) {  //if the NIGHT button is  pressed:
    digitalWrite(13, HIGH);      // turn the blue LED on pin 3 ON
    digitalWrite(7, LOW);      // turn the yellow LED on pin 3 OFF
  }
  else if (digitalRead(6) == HIGH) {  //if the DAY button is  pressed:
    digitalWrite(13, LOW);      // turn the blue LED on pin 3 OFF
    digitalWrite(7, HIGH);      // turn the yellow LED on pin 3 ON
  }
}