<canvas width ="400" height ="400"></canvas>
<script>
var tela = document.querySelector("canvas");
var pincel = tela.getContext('2d');
pincel.fillStyle = "green"
pincel.fillRect(0 , 0, 400 , 400);
pincel.fillStyle = "black"
pincel.fillRect(60 , 60, 100 , 100);
pincel.fillRect(240 , 60, 100 , 100);
pincel.fillRect(150 , 175, 100 , 80);
pincel.fillRect(90 , 220, 65 , 120);
pincel.fillRect(240 , 220, 65 , 120);
</script>