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I appreciate the elegant blog design. Reminds me of Edward Tufte's books.

It's impressive that it doesn't have a mobile view and still looks great.

What? It looks horrible.

Looks great to me and even does what I want when I turn my phone sideways: increase the size of the text.

Ha, I think this site is styled by a single-sheet CSS called Tufte.css

I don't think it is. In Tufte CSS, sidenotes are implemented using float: right [1], while here CSS Grid is used instead.