* { box-sizing: border-box; }
html, body { margin:0; width:1920px; height:1080px; overflow:hidden; background:#000; }
.scene { position:relative; width:1920px; height:1080px; overflow:hidden; background:#000; }
.full-video, .full-image { position:absolute; inset:0; width:100%; height:100%; display:block; object-fit:cover; }
.contain { object-fit:contain; }