* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #102f73;
  color: #ffffff;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
}

body {
  display: grid;
  place-items: center;
}

#game-shell {
  position: relative;
  width: min(100vw, calc(100vh * 750 / 1624));
  height: min(100vh, calc(100vw * 1624 / 750));
  overflow: hidden;
  background: #1d8ddd;
  box-shadow: 0 18px 60px rgba(2, 21, 72, 0.45);
}

#game {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
  touch-action: none;
}

#game:active {
  cursor: grabbing;
}

@media (min-width: 800px) {
  #game-shell {
    border-radius: 20px;
  }
}