Ola!
Meu programa
<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(45, 40, 90, 90 );
  pincel.fillRect(205, 40, 90, 90);
  pincel.fillRect(135, 130,70,100);
  pincel.fillRect(95,190,40,110);
  pincel.fillRect(205,190,40,110);
  </script>