how to define CSSResource for a hover pseudo selector

I am having trouble defining the CssResource interface for the :hover "pseudo selector" on a class.

.foo { ... }

.foo:hover {

    ...

}

I tried using the InterfaceGenerator but it only spits out 

interface Hover extends CssResource {

  String foo();

}

with or without the base selector.

I need this to remove the hover style from a widget.

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