Faq accordion with CSS media queries and Javascript

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

Im very proud of finally do some transitions smooth for the content showing. but what would i do different next time? ¡EVERYTHING! related to the transitions. It take me all day

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

The transition to show the content was so hard and i researched on many videos to finally get a functional solution.

But not perfect i guess.

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

Please, please i need huge feedback on how to improve the transition from the button.

I found than i can improve the javascript with a for loop for all the function i used, but if something is found, i will read it.