Botton to close a widjet

[christiaens.t]

Hi,

In my case I have a widget to control the heating mode => it pops up 4 additional buttons to select the appropriate mode.
Now I have to the select the mode and then push next to the widget to close it.
I would like to auto-close the widget as soon as one of those 4 buttons have been pushed, and thus a heating mode has been selected.

What would be the custom css in this case?

Thank you!

Thijs