.refine-grid-item-close {
    cursor: pointer;
    width: 12px;
    height: 12px;
    position: relative;
    right: 4px;
    background-image: url(/resources/theme/ext4/images/tab/tab-default-close.png);
}

.refine-grid-item-close:hover {
    background-position: -12px;
}