Widget appearance could be a collapse element?

Your plugin is amazing, thank you very much.

I have a detail, is there a way to make the Widget with a collapse effect like the following example?

https://jsfiddle.net/pnjpj3uo/13/

I have many colors and this filter covers a lot of height.

And in my website, throw errors in console log (plugin version 1.0.3).

My best regards.