<canvas width="600" height="400"></canvas>
<script>
var canvas = document.querySelector("canvas");
var pincel = canvas.getContext("2d");
pincel.fillStyle = "grey";
pincel.fillRect(0, 0, 600, 400);
pincel.fillStyle = "darkgreen";
pincel.fillRect(120, 50, 350, 300);
pincel.fillStyle = "black";
pincel.fillRect(170, 100, 90, 90);
pincel.fillStyle = "black";
pincel.fillRect(330, 100, 90, 90);
pincel.fillStyle = "black";
pincel.fillRect(260, 190, 70, 100);
pincel.fillStyle = "black";
pincel.fillRect(220, 250, 40, 100);
pincel.fillStyle = "black";
pincel.fillRect(330, 250, 40, 100);
</script>
