html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  background: #0b2418;
  overflow: hidden;
  touch-action: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

#stage {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 50% 40%, #173d2a 0%, #08170f 100%);
}

canvas#game {
  display: block;
  touch-action: none;
  background: #123a26;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.55);
  border-radius: 6px;
}