creeper funcionou

<canvas width="600" height="400"></canvas>

<script>

    var tela = document.querySelector('canvas');
    var pincel = tela.getContext('2d');

    pincel.fillStyle = 'darkgreen';
    pincel.fillRect(0, 0, 350, 300);

    pincel.fillStyle = 'black';
    pincel.fillRect(50, 20, 90, 90);

    pincel.fillStyle = 'black';
    pincel.fillRect(140, 110, 70, 115);

    pincel.fillStyle = 'black';
    pincel.fillRect(210, 20, 90, 90);

    pincel.fillStyle = 'black';
    pincel.fillRect(95, 160, 45, 140);

    pincel.fillStyle = 'black';
    pincel.fillRect(205, 160, 50, 140);



</script>