<canvas width="600" height="400"> </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(50,50,90,90);
pincel.fillStyle="black"
pincel.fillRect(210,50,90,90);
pincel.fillStyle="black"
pincel.fillRect(140,140,70,100);
pincel.fillStyle="black"
pincel.fillRect(95,190,45,110);
pincel.fillStyle="black"
pincel.fillRect(210,190,45,110);
