createCanvas(400, 400);

}

​

function draw() {

  background(0);

​

  noStroke();

  blendMode(SCREEN);

  fill(255, 0, 0);

  circle(width/2, height/3, 200);

  fill(0, 0, 255);

  circle(width/3, height/1.75, 200);

  fill(0, 255, 0);

  circle(width/1.5, height/1.75, 200);

}