createCanvas(400, 400);

  colorMode(HSB);

​

  noStroke();

​

  let hue = random(360);

  background(hue, random(10, 30), random(80, 100));

​

  fill(random(hue - 10, hue + 10), random(20, 40), random(60, 90));

  rect(50, 75, 300);

​

  fill(random(hue - 10, hue + 10), random(30, 60), random(40, 100));

  rect(100, 150, 200);

​

  fill(random(hue - 10, hue + 10), random(50, 100), random(50, 100));

  rect(150, 225, 100);

}

​