main {
    overflow: hidden;
    position:relative
}

/* 顶部图片 */
.bannerTop {
    width: 100%;
    margin-left: 0px;
}

.bannerTopBgImg {
    width: 100%;
    display: block;
}

.bannerContent {
    position: absolute;
    color: #fff;
    top: 220px;
    width: 300px;
    left: 170px;
}

.bannerContent1 {
    font-size: 36px;
    line-height: 36px;
    font-weight: 900;
}

.bannerContent2 {
    margin-top: 10px;
    font-size: 23px;
    line-height: 23px;
}

.bannerContent3 {
    margin-top: 20px;
    font-size: 12px;
}