body {
  margin: 0;
}
html,
body {
  height: 100%;
  overflow: hidden;
}
canvas {
  display: block;
}

button {
  position: absolute;
  bottom: 100px;
  left: 50%;
  transform: translateX(-50%);
  border: none;
  background-color: #ddd;
  padding: 10px 20px;
  border-radius: 16px;

  &:hover {
    background-color: #eee;
  }
}