When designing, I commonly wish to undo 10-15 steps back, but it is challenging at times to know what you're undoing, which can lead to undoing too far.

Suggestion: Show a note (like the current "There's nothing else to redo" prompt) every time you hit undo. ie:

1. content-parallax > Set Width: 100%

2. content-parallax > Align: Centre

3. body > Color: #333333
   etc
   

That way you will be able to track how far you are undoing.
Obviously, add the note for REDU's also.