In this chapter, you gained knowledge about the most known, classic issues in CSS: centering and opacity. You resolved this problem and gained knowledge about the pros and cons of the solutions. Additionally, you learned how the opacity problem was resolved in old browsers.
In the next chapter, you will learn about modern CSS aspects like flexbox gradients, shadows, transforms, and data attributes. You will also learn about some tricks that you can apply to your code using this feature. Let's move on to the next chapter.