citywebshop_cms/static/css/banner.css

#slideshow {
    width: 100%;
    overflow: hidden;
    margin: 0 auto;
    margin-bottom: 10px;
    margin-top: -30px;
    background-color: #fff;
}

#banner_overlay {
    width: auto;
    height: inherit;
    margin: 0 auto;
}

#banner_overlay img {
    margin: 0 auto;
}