<canvas width ="600" height="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext ("2d");
pincel.fillStyle = "darkgreen"
pincel.fillRect (0, 0, 350, 300);
pincel.fillStyle = "black";
pincel.fillRect(50, 50, 90,90);
pincel.fillRect(210, 50, 90,90);
pincel.fillRect(140,140, 70,120);
pincel.fillRect(110, 180, 40, 120);
pincel.fillRect(200, 180, 40, 120);
</script>
