CSS is a powerful language for styling web pages and user interfaces. In 2023, there are a number of new CSS features that are particularly exciting for web UI development. One of the most significant new features is container queries. Container queries allow you to style elements based on the size of their parent container.

CSS nesting is a very exciting new feature, and it has the potential to make CSS code much more readable and maintainable. CSS nesting can help you to reduce code repetition by allowing you to reuse CSS rules throughout your codebase. Another update in CSS is Wide-gamut color spaces these allow you to use a wider range of colors in your UIs, which can result in more vibrant and realistic images and graphics.