Found by replacing app id on these links.
https://web.archive.org/web//https://cdn.steampowered.com/v/gfx/apps/400/header.jpg
https://web.archive.org/web//https://cdn.cloudflare.steamstatic.com/steam/apps/400/header.jpg
https://web.archive.org/web//https://cdn.akamai.steamstatic.com/steam/apps/400/header.jpg