An example of what is needed in the screenshot. Without using modulate and self modulate
how do I change the color of a button from a script
The easiest way is probably to make a texture button, and use a red and green texture for normal and pressed. If you want it to stay green, select toggle mode.
- Edited
Another way would be to create and assign a theme to the button and then define a theme variation that has a different color and assign it to the button via button.theme_type_variation = "MyPressedButtonThemeVariation".
Perhaps it will be useful to someone
$Button.get_theme_stylebox("hover").bg_color = Color.REBECCA_PURPLE