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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(200,70,90,90);
pincel.fillStyle="black"
pincel.fillRect(140,160,60,90);
pincel.fillStyle="black"
pincel.fillRect(95,190,50,90);
pincel.fillStyle="black"
pincel.fillRect(200,190,50,90);
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