All notes in my theme are essentially markdown, so you'd have to convert what you've got. There would be an up front cost, but I think that the benefit might be worth it. Having said that, as you can see by the discussion on this thread, each person has their own preference for how they keep notes.

Thanks for catching this. Not sure how I managed to make that error. Fixing it now.

For an in-depth look at all the different options for centering an element, have a look at Stephen Shaw's research on Codepen: http://codepen.io/shshaw/full/gEiDt