Change the 'x' button style

[giulianimartini]

Hi,

someone can help me with this little issue?
I can't figure it out which CSS class handles the 'x' button of the selected item.

I know the .filter-select-tag-delete is handling the 'x' tag, but how can I remove the button style? I don't want the shadow or border around the 'x'.
The same occurs with the buttons 'Close' and 'Clear' inside the list picker.

Besides that, the alignment of '3aXm8H34Lo' (selected item) is on top and I can't vertically centralize it. How can I achieve that?

I am sending a screenshot to exemplify:

Thanks in advance.