let r, g, b;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  background(255);

}

​

function draw() {

  x = random(width);

  y = random(height);

  r = random(255);

  g = random(255);

  b = random(255);

  noStroke();

  fill(r, g, b);

  circle(x, y, 20);

}

​