html, body {
  margin: 0; padding: 0; height: 100%;
  background: #0b0812;
  overflow: hidden;
  user-select: none;
}
#wrap {
  height: 100%;
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
#game {
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  background: #0b0812;
  outline: none;
}
#boot {
  position: absolute;
  color: #74d7c4;
  font: 14px "PingFang SC", "Microsoft YaHei", sans-serif;
  letter-spacing: 4px;
}