.top_tail_banner img {
    width: 100%;
}
.top_tail_banner {
    width: 1920px;
    position: relative;
    z-index: 0;
    top: 0;
    left: 50%;
    margin-left: -960px;
}
.main_banner_wrap {
    overflow: hidden;
    width: 100%;
    height: 500px;
    position: relative;
    z-index: 0;
}
.main_banner {
    width: 1920px;
    position: absolute;
    left: 50%;
    margin: 0 0 0 -960px;
    top: 0px;
}

.banner_slider_wrap {
    position: relative;
}

.banner_slider_content img {
    width: 100%;
}