Buenas noches, comparto mi codigo
<canvas width="350" height="300"> </canvas><script> var pantalla = document.querySelector("canvas"); var pincel = pantalla.getContext("2d"); pincel.fillStyle = "darkgreen"; pincel.fillRect (0,0, 350, 300); pincel.fillStyle = "black"; pincel.fillRect (50,70, 90, 90); pincel.fillStyle = "black"; pincel.fillRect (210,70, 90, 90); pincel.fillStyle = "black"; pincel.fillRect (140,160, 70, 100); pincel.fillStyle = "black"; pincel.fillRect (100,195, 40, 110); pincel.fillStyle = "black"; pincel.fillRect (210,195, 40, 110); </script>