createCanvas(400, 400);

  noLoop();

}

​

function draw() {

  background("#f7df1e");

  noFill();

  stroke(0);

  strokeWeight(20);

  rect(px(0.1), py(0.25), px(0.8), py(0.5), 3);

}

​

function px(percent) {

  return width * percent;

}

​

function py(percent) {

  return height * percent;

}