Photon kit is a CSS library that provides a native-like look and feels for widgets. If you have ever worked with Bootstrap, you know that the CSS frameworks are important for creating a responsive user interface. It reduces a lot of efforts by providing solutions to common problems. Photon is almost the same as Bootstrap, but it is built for Electron or any other desktop application development. It's a very lightweight framework that includes CSS styles to create both Mac and Windows native-like widgets and user interface. You can download the Photon library from: http://www.photonkit.com.