xfce4 mask color for transparent background
 

Hi,
I am trying to set a background color for xfce4 panels that will
act as a mask, becoming transparent. I know you can set the
transparency level for whole window (tweaks, composition), but I would like to have just a certain color transparent, all others, including text to stay opaque.
Can be achieved from config or requires code changes.

Thank you.

See the Xfce FAQ's panel transparency section

Thank you, ..Does the whole window not a color.