See this line: https://github.com/react-bootstrap/react-bootstrap/blob/master/src/Modal.js#L58

The className of a modal is hard coded to "modal-dialog". I need to change this specific modal's width, so I'd like to give it a custom class. Passing in className puts the className on the element inside the modal, which is frustrating.

I could give the parent element a custom class and then use a nested selector to match it, but that's not ideal.