This is the nicest collection of web UX components I've ever seen (better than bootstrap). All of the look and feel (responsiveness and delays) are just right.

This is the nicest collection of web UX components I've ever seen (better than bootstrap). All of the look and feel (responsiveness and delays) are just right. Animations are not too heavy-handed and add to the experience. Is this by Stripe? The components look just like their dashboard.