How to set BG color of popup?

[K1200]

Would anyone happen to know how to set the background color of a popup?

I understand that it might be defined as part of the theme.  But the theme my project was assigned during its FM11 to FM14 upgrade is Classic ... and I've read that Classic can't—or shouldn't be—changed.

A picture of what I'm after is shown below ... and thanks for any help on this.

 

[Lee Smith]

It’s tricky, but you use the inspector, and the Appearance Tab. Each part of it can be select. The Top dropdown list has two choices, one is Popover and the is Popover contents - use contents

Edited September 25, 2015 by Lee Smith

[K1200]

The top dropdown list has two choices, one is Popover and the other is Popover contents ...

That worked!

Thank you for the quick response.