model-viewer {
  width: 100%;
  height: 24rem;
  background: #f7f7f7;              
  --poster-color: #fff;
  --poster-image: url("/img/poster.jpg");
  --progress-bar-color: rgba(0,0,0,.5);
  --progress-bar-height: 4px;
  --progress-mask: none;
}