#define ledB 27
#define ledG 28

void setup() {
pinMode(ledB,OUTPUT);
pinMode(ledG,OUTPUT);

}

void loop() {
  for(int i=0; i< 255; i++)
{
  analogWrite (ledB,i);
  delay(10);
}
  for(int i=255; i>0; i--)
{
  analogWrite (ledB,i);
  delay(10);
}

for(int x=0; x<= 255; x++)
{
  analogWrite (ledG,x);
  delay(10);
}

  for(int x=255; x>0; x--)
{
  analogWrite (ledG,x);
  delay(10);
}
}