<canvas width="600" height="400"></canvas>
<script>
    var mine = document.querySelector('canvas');
    var craft =mine.getContext('2d');
    craft.fillStyle = 'darkgreen';
    craft.fillRect (220,80,320,300);
   craft.fillStyle = 'black';
   craft.fillRect (250,110,90,90);
   craft.fillRect (410,110,90,90);
  craft.fillRect(340,200,70,100);
   craft.fillRect (300,240,40,110);
   craft.fillRect (410,240,40,110);    
</script> 
            