Update styles.css

[Imran-imtiaz48]

This CSS code enhances readability and maintainability through consistent formatting, proper spacing, indentation, and alignment. Structured section headers with clear comments improve navigation, making it easier to modify and extend the code. Unnecessary vendor prefixes, such as -webkit- and -ms-, have been removed unless specifically required, ensuring a cleaner and more modern approach. Additionally, media queries have been optimized for better scalability, creating a more maintainable and responsive design. The logical grouping of styles into distinct sections further enhances clarity, making the codebase more professional and efficient for future modifications.