body {
  background-color: #222;
}

h1 {
  text-align: center;
  color: #eee;
}

#container {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  margin: 0;
  padding: 0;
}

canvas {
    border: 2px solid #3a3e66;
    background-color: #222;
}