## Portal
Render children into an outside DOM hierarchy. Useful for modals, notifications, popovers, flyouts,
etc.
* `Portal` only handles the outside DOM mounting/unmounting logic.
* All styles, event handlers, and behaviors must be implemented by the parent component.
* Context is passed from the Portal parent to the children components
* All props passed to `Portal` are passed to the inner-wrapper div
### Usage
```jsx
import { Portal } from 'box-ui-elements';
const MyPortalExample = () => {
if (!this.props.isOpen) return null;
return (
...
);
}
// Which renders:
...
```