This is a tip on how to override CSS like color of button in a form PER BUTTON. To do this you can use CSS selectors.
Screenshot:
Instructions:
1. Make sure you have a UNIQUE tooltip added to the button, for example "This button does X".
2. Add the following CSS selector to the theme file of the theme you are using:
a[data-qtip="This button does X"] { background-color: #000 !important; };