body {
  margin: 0;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

.toolbar {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 10;
  background: rgba(255, 255, 255, 0.9);
  padding: 10px;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
}