Hello! I have two questions.
I'm trying to create a UI for a piece of software I'm writing in Godot, but I'm having a bit of trouble. I kinda want it to look like the Godot editor, but I have no idea how to arrange controls nodes to do that. Is there a way to view the underlying node tree of the Godot editor?

For instance, I'd like to recreate the above color picker button (where it shows the color you've chosen on the button) but the default ColorPickerButton doesn't have that functionality.
Secondly, I don't really like the default theme of the ingame nodes, but I do like the theme of the Godot editor. Is there a way to use the theme of the Godot editor ingame?