.csl-boxcast-wrap{position:relative;width:100%;aspect-ratio:16/9;overflow:hidden;border-radius:12px;background:#101820}.csl-boxcast-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.csl-boxcast-empty{padding:18px;border:1px solid #ccc;border-radius:8px}