How are themes inherited in Godot?

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:bust_in_silhouette: Asked By derekjwhitten

I have created a theme and applied it to the root node in my project (a Control node named ‘Game’ in the attached screenshot). The styles are inherited by child nodes (eg Button1 in the screenshot), but once it goes below another Control node the styles are on longer inherited (eg Button2 in the screenshot), even though no theme is applied on the new parent Control node.

So my question is, how far does theme inheritance go? Is there a way I can have the theme applied once but inherited by all children and grand-children?