Hi, all! I have eyesight issues and ADHD so I really appreciate the ability to change the colors and fonts in the ebook viewer, but sometimes I lose my place on the page. The iOS kindle app has this thing called a "reading ruler" that you can place anywhere in the page and it stays still while you scroll the text through it. It will highlight a few lines of text, allowing you to remember where you were last reading. This is immensely helpful to me, and I wonder if there's any way to do it with calibre?
