var tela = document.querySelector('canvas');
var pincel = tela.getContext('2d');
pincel.fillStyle = 'darkgreen';
pincel.fillRect(125, 50, 350, 300);
pincel.fillStyle = 'black';
pincel.fillRect(170, 110, 90, 90);
pincel.fillRect(330, 110, 90, 90);
pincel.fillRect(260, 200, 70, 100);
pincel.fillRect(220, 240, 40, 110);
pincel.fillRect(330, 240, 40, 110);