body {
  margin: 0;
  overflow: hidden;
  font-family: Arial, sans-serif;
}
#canvas {
  display: block;
  background-color: #111;
}
#ui-panel {
  position: fixed;
  top: 10px;
  left: 10px;
  background: rgba(0,0,0,0.7);
  color: #fff;
  padding: 10px;
  border-radius: 8px;
  font-size: 14px;
}
#ui-panel ul {
  margin: 5px 0 0 15px;
  padding: 0;
}