Added individual classes to donation tables

These will allow further customize the tables later on, if needed.
Additionally, I added plus signs to the positive money differences which allows the values to line up better and convey donations more effectively.
Changed the nondescript "-" that could be confused with a missing deduction of money to a more understandable "null".
Edits are necessary because whitespace only results in a maximum of 1 space, and only under certain conditions.