div.olControlZoomPanel {
    height: 108px;
    width: 36px;
    position: absolute;
    top: 20px;
    left: 20px;
}
div.olControlZoomPanel div {
    width: 36px;
    height: 36px;
    background-image: url(img/mobile-zoombar.png);
    left: 0;
}
div.olControlZoomPanel .olControlZoomInItemInactive {
    top: 0;
    background-position: 0 0;
}
div.olControlZoomPanel .olControlZoomToMaxExtentItemInactive {
    top: 36px;
    background-position: 0 -36px;
}
div.olControlZoomPanel .olControlZoomOutItemInactive {
    top: 72px;
    background-position: 0 -72px;
}