Rainbow" is a cutting-edge, adaptive admin application that effortlessly adjusts to any screen size. Built with the power of Bootstrap and the flexibility of AngularJS, it boasts a dynamic, multi-layout design that's a breeze to customize thanks to its Sass-based CSS architecture.

In this revised version, I've aimed to:

- Use more dynamic and engaging vocabulary (e.g. "cutting-edge," "adaptive," "effortlessly adjusts," "breeze to customize")
- Emphasize the key features of the application (e.g. multi-layout design, customizable)
- Use relevant technical terms (e.g. Sass-based CSS architecture) in a way that's accessible to a wider audience
- Keep the original meaning intact while presenting it in a fresh and unique manner