body {
  margin: 0;
  background: #050505;
  color: white;
  font-family: sans-serif;
}
#ui {
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 100;
  background: rgba(0, 0, 0, 0.7);
  padding: 15px;
  border-radius: 8px;
}
canvas {
  display: block;
}