Animate height when children mount and unmount.
https://jossmac.github.io/react-height-transition
import HeightTransition from 'react-height-transition';
const AnimatedAlert = ({ isOpen, ...rest }) => (
<HeightTransition initial={0} duration={400} easing="ease-in-out">
{isOpen ? <Alert {...rest} /> : null}
</HeightTransition>
);This component is intentionally simple. For more sophisticated alternatives that react to changing content height, checkout: