I want to change the background/Text color of the calendar. I tried will all the possible CSS but could not able to change anything. Is it possible to change the UI for calendar also Is there a way in Mendix where we can check what are the classes and CSS property has been added to the particular widget.
You can add a custom class in the Appearance tab, you can set it to "StyleCalendar," for example.
then you can style whatever you want, like the below, in your style file.