Requests stream along the top in accent and return underneath in muted, with per-hop latency labels and a loop that closes exactly

This is the format it was composed for. Switch above to see it lay itself out for another — same animation, re-arranged for the frame.
No Tailwind, no CSS, no asset files. Inline styles only.
Data flowing between services: dots travelling right along a top rail and returning left along a bottom rail in a muted colour, with latency labels on each hop, looping seamlessly.