The background rule of the page should be sized to the text size automatically. That is, each line of text should line up with the background image of the ruled page. As the text size changes, so should the background rule image.

Currently, the best one can do is 16px text with the narrow rule. This doesn't quite line up, and the text is too big anyway. There should be a rule size that lines up perfectly with 10px or 12px text, and the text tool should snap to it. This is a minor issue when looking at the notes on the page, but it is a pain when exporting the notes to another format for sharing.