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Any idea what the website's built with? I really like the design/UI tbh

As the sibling comment mentions, it's Astro:

Looks cool, reminds of a VHS box. Also nails the look of 70s decor that was everywhere when I was growing up in the 80s/90s.

The HTML generator meta tag (f11 to open dev tools) says it's Astro: https://astro.build/