html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  font-family: sans-serif;
  color: #444;
  text-align: center;
  font-size: 12px;
  z-index: 0;
}
  
h1 {
  position: absolute; 
  top: 0;
  width: 100%;
  color: white;
  pointer-events: none;
  z-index: 1;
}
  
#scene-container, canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  z-index: 0
}

#restart-btn {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 1000;
  padding: 0.5rem 1rem;
  background: #333;
  color: white;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#restart-btn:hover {
  background: #555;
}