body {
  margin: 0;
  overflow: hidden;
}
canvas {
  display: block;
}
#controls {
  position: absolute;
  bottom: 30px;
  left: 30px;
}
button {
  display: flex;
  justify-content: center;
  align-items: center;

  background-color: rgb(82, 81, 81);
  color: #fff;
  filter: grayscale(2);

  width: 50px;
  height: 50px;
  margin: 5px;
  font-size: 18px;
}