.wp-pagenavi {
    /* hier die Styles für den Container-div */
}

.wp-pagenavi .pages {
    float: right;
}

.wp-pagenavi a {
    margin: 0 5px 0 0;
    padding: 4px 5px;
    color: #505050;
    text-align: center;
}

.wp-pagenavi .current {
    margin: 0 5px 0 0;
    padding: 4px 8px;
    background: #505050;
    color: #fff;
    text-align: center;
}