<canvas width="600" height="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext("2d");
pincel.fillStyle = "darkgreen";
pincel.fillRect(0, 0, 600, 400);
pincel.fillStyle = "black";
pincel.fillRect(170, 100, 90, 90);
pincel.fillRect(330, 100, 90, 90);
pincel.fillRect(260, 190, 70, 100);
pincel.fillRect(220, 230, 40, 110);
pincel.fillRect(330, 230, 40, 110);
</script>
