HEADS UP! this repo is deprecated and not receiving any more updates.
Don't worry though, that's because it's been succeeded by https://github.com/react-restart/ui which is built off of react-overlays by the same team.
Utilities for creating robust overlay components.
https://react-bootstrap.github.io/react-overlays
npm install --save react-overlays
All of these utilities have been abstracted out of React-Bootstrap in order to provide better access to the generic implementations of these commonly-needed components. The included components are building blocks for creating more polished components. Everything is bring-your-own-styles, CSS or otherwise.
If you are looking for more complete overlays, modals, or tooltips – something you can use out-of-the-box – check out React-Bootstrap, which is built using these components.