.demo-viewport { overflow: hidden; background: #98a99d; touch-action: none; cursor: grab; outline: none; }
.demo-viewport:active { cursor: grabbing; }
.demo-scene { position: absolute; left: 50%; top: 50%; width: 0; height: 0; transform-style: preserve-3d; }
.demo-face { position: absolute; width: 1000px; height: 1000px; top: -500px; left: -500px; backface-visibility: hidden; }
.demo-face svg { display: block; width: 100%; height: 100%; }