Claude has a very recognizable style of web design and graphics it creates.
It also loves to spam tiny little explanations in certain places with punchy, short sentences. ("Deepest room reached, per bot name. Bots: 1,029,000 requests. Humans: 193,000 page views.", "412,057 of them in a single day. They never found a button, because there isn't one.")
https://op.tngl.io/every-fucking-website/ does this look familiar?