It works using the Bootstrap 4 collapse component with cards to make a vertical accordion that expands and collapses as questions are toggled.
Bootstrap is the most popular CSS framework in the world. The latest version released in 2018 is Bootstrap 4. Bootstrap can be used to quickly build responsive websites.
The answer to the question can go here.
The answer to this question can go here. This FAQ example can contain all the Q/A that is needed.