createCanvas(400, 400);

  rectMode(CENTER);

}

​

function draw() {

  background(0);

  print(mouseX, mouseY)

   rect(width / 2, height / 2, 200, 200);

  if (mouseX > 100 && mouseX <300 && mouseY > 100 && mouseY < 300) {

     fill ("green")

  } else {

   fill ("red")

​

​

  } //runs if false (mouse is not pressed)

}