Is it possible to set context menu transparency background?

Is it possible to set context menu transparency background?
I use svg shape as a menu and I want to have only svg shape. How can i change context menu background to transparency?

If you are implementing a context menu using GoJS objects, then yes – just set the Panel.background to what you want.

If you are implementing a context menu in HTML, then yes – just set the element’s background.

https://gojs.net/latest/intro/contextmenus.html