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>