I have been experimenting the Hanzi Writer inside an Observable notebook. So far so good on a desktop browser. Everything seems to be fine. Here is a sample notebook I just created to repro this issue:
However, when I open the notebook on a mobile browser (tried both Safari and Chrome on iOS), the strokes are rendered with extremely thickness (see below).
The strokes can be rendered correctly on Hanzi Writer’s website itself:
BTW, I happened to see Mike has also created a notebook for Hanzi Writer. But it seems to have the same problem on a mobile browser:
What could be wrong?