createCanvas(400, 400);

}

​

function draw() {

  background(0);

  noStroke();

  fill('white');

  circle(200, 200, 200 + 20 * noise(frameCount / 20))

  noFill();

  stroke('red');

  circle(200, 200, 180 + 20 * noise(frameCount / 10))

}