FAQ accordion with HTML, CSS & Javascript

What are you most proud of, and what would you do differently next time?

Very proud about using Javascript DOM, it works very nice!

What challenges did you encounter, and how did you overcome them?

The challenge was on Javascript DOM, using the toggle function.

What specific areas of your project would you like help with?

I would like a feedback about the Javascript DOM, if everything is correct, and about background-image too. And i would like to know if using image inside of a heading element is a bad practice.