body{
  font-family: arial;
  margin: 0;
  overflow: hidden;
  background: #2B2B2B;
}

canvas {
  position: absolute;
  background: white;
  display: block;
  margin-left: -320px;
  margin-top: -200px;
  top: 50%;
  left: 50%;
}

.loading {
  text-align: center;
  width: 640px;
  height: 50px;
  position: absolute;
  left: 50%;
  top: 50%;
  color: white;
  margin-left: -320px;
  margin-top: -25px;
}