body {
  margin: 0;
}

#popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 20px;
  border-radius: 10px;
  font-family: Arial, sans-serif;
  display: none;
}

#controls-popup {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(0, 0, 0, 0.8);
  border-radius: 10px;
  padding: 20px 30px;
  font-family: Arial, sans-serif;
  z-index: 1000;
  display: none;
  text-align: center;
  box-shadow: 0 0 20px rgba(0,0,0,0.3);
  color: white;
}