It sounds like you're using Dark Mode in the game, which is why your Token Actions are purple. If you use Light Mode they will be grey.
The easiest way to adjust the colors of Token Action buttons is by using the Stylus extension. Scripts cannot change the color of Token Action Buttons.
Here's an example of code that can be used to change the color of individual Token Actions (based on their #ID, which you can find using your browser's Inspect feature): https://app.roll20.net/forum/post/10802054/show-off-your-style-4-a-new-hope/?pageforid=10802064#post-10802064 .
Or if you want all of the Token Actions to have the same background and font color, here is some code for that.
@-moz-document regexp("https://app.roll20.*.net/editor/.*") {
ul.mode.tokenactions button.btn {
background:red;
color: blue;
} }
I made it red and blue just so it was clear what you'd need to change to get the color your want.
