createCanvas(windowWidth, windowHeight);

  noLoop();

}

​

let margin = 25;

let sqPerRow = 8;

​

function draw() {

  background(220, 10, 100);

​

  let rowWidth = width - 2 * margin;

  let sqWidth = rowWidth / sqPerRow;

​

  for (let col = 0; col < sqPerRow; col += 1) {

    let xPos = col * sqWidth + margin;

    if (col % 2 == 0) {

      fill(0);

    } else {

      fill(255);

    }

    rect(xPos, 50, sqWidth, sqWidth);

  }

}

​