Now that you know the basics of CSS, you can relax a bit. In this course—the third installment in a series—get acquainted with some advanced CSS concepts that can help you enhance your websites even further. Christina Truong covers new CSS layout options that can make your life simpler, including how to use grids and how to use a flexbox of flex containers and flex items. She explains how Retina displays changed how images and graphics are displayed—and in turn, altered how developers build websites. In addition, she shows how to add animation and transitions, and make your site accessible to as many people as possible.