Chat app CSS illustration solution (Animated)

This was a very fun challenge, full of new things to learn and many more to practice.

Easy:

• the initial drawing: making the original design was simple and fun, and I was able to exercise everything I've learned so far in previous challenges.

Difficult:

• Optimize the design of the css and html, since it used too many classes and tags, even after finishing I think it can be further optimized.
• the changes in the drawing to allow the animations, which already represented a load of resources.
• for rendering reasons, the drawing did not look the same in safari and mozilla, which made me change a large part of the structure, so that in both cases it would stay as good as possible (achieved after a few minutes of changes)
• the animation: deciding what to do, how much to do, and limiting myself to only a maxi or 10 seconds of animation was very difficult, and that taking into account not accidentally destroying what I had already done (I would like some advice on animation .. ...)

Impossible:

• ...as always... NAME things!!!!

This was a very fun challenge, full of new things to learn and many more to practice. Easy:

• the initial drawing: making the original design was simple and fun, and I was able to exercise everything I've learned so far in previous challenges. Difficult:
• Optimize the design of the css and html, since it used too many classes and tags, even after finishing I think it can be further optimized.
• the changes in the drawing to allow the animations, which already represented a load of resources.
• for rendering reasons, the drawing did not look the same in safari and mozilla, which made me change a large part of the structure, so that in both cases it would stay as good as possible (achieved after a few minutes of changes)
• the animation: deciding what to do, how much to do, and limiting myself to only a maxi or 10 seconds of animation was very difficult, and that taking into account not accidentally destroying what I had already done (I would like some advice on animation .. ...) Impossible:
• ...as always... NAME things!!!!

Thanks in advance for your advice and feedback.