<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, 60, 90, 90);
pincel.fillStyle = 'black';
pincel.fillRect(210, 60, 90, 90)
pincel.fillStyle = 'black';
pincel.fillRect(140, 150 , 70, 100);
pincel.fillStyle = 'black';
pincel.fillRect(100, 190 , 40, 110);
pincel.fillStyle = 'black';
pincel.fillRect(210, 190 , 40, 110);
</script>
