Positioning and sizing nodes in 3d canvas

[juanjavatus]

Hi dear sir,
I would like to know how to set a node parameters to adapt position and size. For example, I would like a node to be a button which can rotate on pressed. Imagine in your checker example. You have two buttons in the left top corner. I would like these buttons were two nodes and they stayed in that position as window resizes and changed size accordingly.

Best regards