charlotte

  for (int i=0; i<gridSize; i++) {
    for (int j=0; j<gridSize; j++) {

      fill(140, 180); // shadow
      rect(gap * (i+1) + cellsize * i + offsetX, gap * (j+1) + cellsize * j + offsetY, cellsize, cellsize);

      fill(247, 57, 57, 180); // rectangle
      rect(gap * (i+1) + cellsize * i, gap * (j+1) + cellsize * j, cellsize, cellsize);
      println("i=", i, "j =", j);
    }
  }