LED Chaser using arduino

void setup()
{
pinMode(8,OUTPUT);
pinMode(9,OUTPUT);
pinMode(10,OUTPUT);
pinMode(11,OUTPUT);
pinMode(12,OUTPUT);
pinMode(13,OUTPUT);
}

void loop()
{
digitalWrite(8, HIGH);
  delay(100);
digitalWrite(9, HIGH);
  delay(100);
digitalWrite(10, HIGH);
  delay(100);
digitalWrite(11, HIGH);
  delay(100);
digitalWrite(12, HIGH);
  delay(100);
digitalWrite(13, HIGH);
delay(100);
digitalWrite(8, LOW);
  delay(100);
digitalWrite(9, LOW);
  delay(100);
digitalWrite(10, LOW);
  delay(100);
digitalWrite(11, LOW);
  delay(100);
digitalWrite(12, LOW);
  delay(100);
digitalWrite(13, LOW);
delay(100);
}