How can i make canvas that overlapps a webviewer?

I have a canvas which servers me as a joystick.
In the web viewer i want to have a vision from my ipcamera placed on my robot.
So i want the canvas to overlapp the webviewer - like placing it on a diffrent layer.

Best i can do is something like this: Screenshot by Lightshot
vs what i want: Screenshot by Lightshot

I want the webviewer to take the whole screen and have the canvas on top of it in bottom left corner.

I just started my adventure with kodular so please be patient :slight_smile:

Thank You in advance.