feature: More css styles, light/dark mode toggle option, and improved README is required

[Bipasha1005]

As a GSSoC'25 contributor, I suggest the following enhancements for the repository:

1. Add More Styles: Expand the range of available styles to increase the versatility and appeal of the project.
2. Light/Dark Mode Toggle: Implement a feature that allows users to switch between light and dark modes for improved user experience and accessibility.
3. Detailed README: A README file to provide detailed information about the project, including setup instructions, features, usage examples, and contribution guidelines.

I am interested in working on these improvements and would like to contribute to their implementation.

[Bipasha1005]

Hi,
I have created a pull request addressing this issue: #40
It includes the additional CSS styles, light/dark mode toggle improvements as discussed.
Please review it and let me know if any changes are needed. Thank you!