Free Bootstrap 4 and Reactstrap UI Kit
"Paper Kit React is a free Bootstrap 4, React, React Hooks and Reactstrap UI Kit with pale colors, beautiful typography and thoughtful drawings. We've created it having paper and drawings in mind.
Any elements that is vital to code a web project is already here, fully coded. All components are fully responsive and look great on every screen size. Transitions, shadows, colors, they all resemble the flow you would have using pieces of paper.
We have created the UI Kit kit having pastel colors and paper in mind. It feels light, fresh and easy to go through. It features beautiful typography, font icons and thoughtful layouts."