html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background: #b37dfe;
}
body {
  display: flex;
  align-items: center;
  justify-content: center;
}
#game-shell {
  position: relative;
  width: 800px;
  height: 600px;
  flex: 0 0 auto;
  transform-origin: center center;
}
#canvas {
  display: block;
  width: 800px;
  height: 600px;
  background: #b37dfe;
  visibility: hidden;
}
#load-percent {
  position: absolute;
  left: 12px;
  top: 10px;
  z-index: 2;
  font: 14px Arial, sans-serif;
  color: #fff;
  pointer-events: none;
}