How does this website retain it’s size at all zoom levels?

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So I was admiring this website:

www.studio-size.com

And I would like to find out how they keep their site the same size, even when you zoom in or out. With the mobile breakpoint being the exception.

Whether it’s 100% zoom or 25% it remains the same size and content does not scale or change in anyway.

Any clues?

Thanks

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