Solved! Go to Solution.
Adding in to clarify, the rollover is not necessarily purple, but the “Default” color when you edit the button style. The following are the colors which are default and appear as it is if you do not choose a custom color;
If you want to use a color which is not available in these styles, you can choose a default style and alter its color through edit CSS and not through editor(Custom colors). The Forms 2.0 editor leaves the roll over color to be left as default color of the style. Even if you want to set different colors for roll over and the default color of your own choice you’ll have to edit the CSS - of course for a great design!