body {
  margin: 0;
  background-color: #000;
  overflow: hidden;
}
#canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
}
#main-gui {
  position: absolute;
  top: 5px;
  right: 5px;
}
#second-gui {
  position: absolute;
  top: 5px;
  left: 5px;
}
#progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background-color: rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: none;
}
#progress-fill {
  height: 100%;
  background: linear-gradient(90deg, #4CAF50, #45a049);
  width: 0%;
  transition: width 0.3s ease;
}