css - Changing hover style for QComboBox -

i using qt 5.1.1 trying change background color , text color element when cursor on element. have tried following style sheet:

qcombobox qabstractitemview::item:hover {color: black;background: white } 

but , many tried css code hasn't worked. correct way?

this should work:

qcombobox qabstractitemview {   selection-color: red;   selection-background-color: blue; }