createCanvas(500, 400);

}

​

function draw() {

  background(9, 255, 255);

  //diagonal line

  stroke("red")

  strokeWeight(35);

  line(0,0, 500, 400);

  //green circle

  noStroke();

  fill(0, 200, 1);

  ellipse(250, 200, 250, 200);

  //blue square

  rectMode(CENTER);

  fill(5, 0 ,128);

  rect(355,180, 38, 38);

  print(mouseX, mouseY);

}