[crazyarm]

I have highlights in many books and I am trying to find the best color combination for both daytime and nighttime reading. I would like to be able to change the color of all my highlights (or a subset of them) at once, rather than needing to individually change the color to a new scheme. Is this possible? I dug around trying to edit the `calibre_bookmarks.txt` file inside the epubs, but failed to get Calibre to see/accept the changes.