Broadcast embed demo
1000px wide, default settings
<iframe src="https://lichess.org/embed/broadcast/fide-world-rapidblitz-team-championships-2024--rapid-matches-1-10/round-9/1wyZfsUJ" style="max-width: 1000px; aspect-ratio: 4/3;" frameborder="0"></iframe>
600px wide, white theme, custom board and pieces
<iframe src="https://lichess.org/embed/broadcast/sixdays-budapest-july-2024--gm-a/round-9/GRmikgAP?bg=light&theme=green&pieceSet=cooke" style="max-width: 600px; aspect-ratio: 4/3;" frameborder="0"></iframe>