body {
  padding: 0;
  margin: 0;
}

#loading-overlay {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-color: rgba(0,0,0,.5);
}

#spinner {
  width: 50px;
  height: 50px;
  margin-top: -40px;
  margin-left: -40px;

  position: absolute;
  top: 50%;
  left: 50%;

  border-width: 120px;
  border-radius: 50%;
  border: 16px solid #33abda;
  border-top: 16px solid #3c3c3c;
  -webkit-animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

canvas {
  display: block;
}

.hidden {
  display: none;
}