Is it possible to add an effect to the dropdown element of webflow elemnents panel?

[karle (le corp)]

It’s ok for the effect on “deontologie” button.

But I trying to apply the effect on the two others dropdown buttons. For that I set the two others with the same class “dropdown”, I selected class button instead element buton in the effect panel, I set a “close delay” on each dropdown button. But doesn’t work.