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

#canvas-container {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
}

#ui {
  position: absolute;
  top: 10px;
  left: 10px;
  background: rgba(255,255,255,0.9);
  padding: 10px;
  border-radius: 4px;
  z-index: 10;
}

#ui label {
  display: block;
  margin-bottom: 5px;
}

#ui input[type="number"] {
  width: 60px;
}