Possible to provide option for animation when changing CSS classes?

[labo-China]

Textual will apply animations when scrolling, which is very convenient and beautiful.
But there is no option to animate when changing CSS classes.
That is to say, I have to manually write animations for every attributes, which may cause unnecessary work and complexity.
In my view, there are several ways to tackle with it:

• Support animating when changing CSS classes
• Provide a way to update styles in a batch (e.g. widget.styles.update_batch(**styles))
• Make animate() method accepts classes

I will be glad if you guys think it is helpful!