You have learned how to modify quite a number of elements in your PrestaShop site using CSS.
More specifically, covered:
Now that you've learned about making basic changes to your PrestaShop theme, we will move onto the next chapter to learn about another important element, which is the images and background images. This is an important aspect in PrestaShop. As you can see, PrestaShop is quite "heavy" on using background images in its theming.