createCanvas(windowWidth, windowHeight);

}

​

function draw(){

  blendMode(BLEND);

  background(255);

  fill(255);

  blendMode(DIFFERENCE);

  noStroke();

​

  let x = width / 2;

  let y = height / 2;

  let size = height/2;

  rectMode(CENTER);

  rect(x, y, size, size);

  push();

  translate(size / 4, size / 4);

  rect(x, y, size, size);

  pop();

}

​

function windowResized () {

  resizeCanvas(windowWidth, windowHeight);

}

​