body {
  background-color: #222;
  padding: 0;
  margin: 0;
}

#canvas {
  width: 100%;
  height: 100vh;
}

#buttons {
  position: absolute;
  top: 20px;
  left: 20px;
}

button {
  padding-left: 10px;
  padding-right: 10px;
  font-size: 28px;
  margin-right: 20px;
  border-radius: 12px;
  opacity: 0.5;
}