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the width of the body should be like the following so that it behaves nicely on mobile phones

body { max-width: 650px; }

Good catch. I just wrote this CSS for my computer but I suppose for other devices you'd need to adjust that

Computers too fwiw. I tried your CSS on my PC, but I had the page up side-by-side with something else and the text overflowed the page.

edit: that didn't entirely make sense, so I looked again and I was zoomed it a couple of notches.