Responsive landing page using CSS Flex and JS

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

I added an animation whenever the text panels appear, although I would prefer it to be different and smoother when the new div(s) is appearing (proper animation should look like it is gradually enlarging instead of it just suddenly being expanded)

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

Accessing CSS properties from an in-line javascript block within the html file. I was kinda lost accessing the DOM

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

Improving the animation