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I think the css you need is:-

.nodeStats dl, .subForumsPopup a:hover {background: none transparent !important;}

.Popup .PopupControl.PopupOpen, .Popup.PopupContainerControl.PopupOpen {

    background: none transparent !important;}

.Popup .PopupControl.PopupOpen:focus, .Popup.PopupContainerControl.PopupOpen:hover {

    background-image: none transparent !important;}