html, body { margin:0; padding:0; overflow:hidden; }
  #cloak-overlay {
    position: fixed; top:0; left:0; right:0; bottom:0;
    background:#fff; z-index:999999;
    display:flex; justify-content:center; align-items:center;
  }
  .cloak-spinner {
    width:60px; height:60px;
    border:8px solid #ccc; border-top:8px solid #0f0;
    border-radius:50%; animation: spin 1s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }
  #debug {
    font-family:monospace; padding:20px;
    white-space:pre-wrap; word-wrap:break-word;
    z-index:1000000; display:none;
  }