createCanvas(windowWidth, windowHeight);

  background(220);

}

​

function draw() {

  let x = random(width);

  let y = random(height);

  let r = random(255);

  let g = random(255);

  let b = random(255);

  noStroke();

  fill(r, g, b, 100);

  circle(x, y, 20);

}

​