*{
  margin: 0;
  padding: 0;
}
body {
  background: white;
}
canvas {
  margin: 20px auto;  
  width: 538px;
  display: block;
}
html, body, #wrapper {
   height:100%;
   width: 100%;
   margin: 0;
   padding: 0;
   border: 0;
}
#wrapper td {
   vertical-align: middle;
   text-align: center;
}