.callbacks_nav {
position: absolute;
    -webkit-tap-highlight-color: rgba(0,0,0,0);
    top: 52%;
    left: 0;
    opacity: 0.7;
    z-index: 3;
    text-indent: -9999px;
    overflow: hidden;
    text-decoration: none;
    height: 31px;
    width: 20px;
    background: transparent url(themes/themes_small.png) no-repeat left top;
    margin-top: -23px;
}