#define Pull_down_button_pin 2
#define Red_led_pin 3
#define Pull_up_button_pin 21
#define Blue_led_pin 20

int Pull_down_buttonState = 0;  // variable for reading the pushbutton status
int Pull_up_buttonState = 0;  // variable for reading the pushbutton status

void setup() {
  // initialize digital pins for LEDS as an output and buttons as INPUTS
  pinMode(Red_led_pin, OUTPUT);
  pinMode(Pull_down_button_pin, INPUT);
  pinMode(Blue_led_pin, OUTPUT);
  pinMode(Pull_up_button_pin, INPUT);
}

// the setup function runs once when you press reset or power the board
void loop() {
Pull_down_buttonState = digitalRead(Pull_down_button_pin);
Pull_up_buttonState = digitalRead(Pull_up_button_pin);
// check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (Pull_down_buttonState == HIGH) {
    // turn LED on:
    digitalWrite(Red_led_pin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(Red_led_pin, LOW);
  }
  if (Pull_up_buttonState == LOW) {
    // turn LED on:
    digitalWrite(Blue_led_pin, HIGH);
  } else {
    // turn LED off:
    digitalWrite(Blue_led_pin, LOW);
  }
}