body {
  margin: 0;
  background: #111;
  color: #fff;
  font-family: "Noto Sans JP", sans-serif;
}

#app {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
}

canvas {
  border: 2px solid #333;
  background: #1b1b1f;
}

.help {
  text-align: center;
  padding-bottom: 16px;
  color: #c9c9c9;
  font-size: 14px;
}