html, body {
  margin: 0;
  padding: 0;
  background-color: #222222;
  overflow: hidden;
}

#defaultCanvas0 {
  height: auto !important;
  width: auto !important;
  max-height: 95% !important;
  max-width: 95% !important;
  position: fixed;
  top: 50%;
  left: 50%;
  -ms-transform: translateY(-50%) translateX(-50%);
  transform: translateY(-50%) translateX(-50%);
}