createCanvas(400, 400);

}

​

function draw() {

  background(220);

  let h = mouseX;

  if (h >360) {

    h = h - 360;

  }

  let s = mouseY;

    colorMode(HSL, 360);

  fill(h,s,200);

  ellipse(200,200,50,50);

​

​

}