<canvas width = "600" height = "400">
</canvas>
<script>
var pantalla = document.querySelector("canvas");
var pincel = pantalla.getContext("2d");
pincel.fillStyle = "grey"
pincel.fillRect(0,0,600,400);
pincel.fillStyle = "darkgreen"
pincel.fillRect(125,50,350,300);
pincel.fillStyle = "black"
pincel.fillRect(170,100,90,90);
pincel.fillStyle = "black"
pincel.fillRect(330,100,90,90);
pincel.fillStyle = "black"
pincel.fillRect(260,190,70,100);
pincel.fillStyle = "black"
pincel.fillRect(220,240,40,110);
pincel.fillStyle = "black"
pincel.fillRect(330,240,40,110);
</script>
