Responsive FAQ now with accordion action!

The most difficult part of the project BY FAR was the controlling the images. Please look over my solution and report if I succeeded and if there was a better/faster approach than the one I took. (I'm guessing there was...)

Any other thoughts and feedback to help me grow as a developer is much appreciated.

Thoughts on accessibility? I read several articles that addressed hiding content and accessibility. I believe I chose the correct course of action. Thoughts?

Thank you in advance for reviewing my project and providing useful feedback. Cheers!