change hover background color of a button in the toolbar

Hi webix team, in the snipped http://webix.com/snippet/39005e20 I have changed the background-color of the toolbar to grey, but I want also change the hover color of the button. How to do this?

In such case,hover andfocus CSS selectors are required:

http://webix.com/snippet/55b36b1c

Hi Listopad, thanks this helps me a lot in my customer project