/* The doorway is transparent in the SVG itself, including alpha-only masks. */
#entranceFacade {
  -webkit-mask-image: url('facade-mask.svg');
  mask-image: url('facade-mask.svg');
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  mask-mode: alpha;
}