int button1 = 2; 
int button2 = 3; 
int led1 = 4; 
int led2 = 5; 

void setup(){ 
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
}

void loop() {

    if (digitalRead(button1)==LOW) {
      digitalWrite(led1, HIGH); 
    } else {
      digitalWrite(led1, LOW); 
  }
    if (digitalRead(button2)==LOW) {
      digitalWrite(led2, HIGH); 
    } else {
      digitalWrite(led2, LOW);
    }
  }