*{
    margin: 0;
    padding: 0;
}
.row{
    margin-left: 0px !important;
    margin-right: 0px !important;
}
.banner{
    height: 450px;
    color: #fff;
    position: relative;
}
.banner_txt{
    position: absolute;
    top: 0;
    width: 100%;
    text-align: center;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}
.banner_txt div:nth-child(1){
    font-size: 54px;
}
.banner_txt div:nth-child(2){
    font-size: 16px;
}
.wenzhang{
    max-width: 1150px;
    margin: 45px auto;
    font-size: 16px;
    padding: 0 10px;
}
.wenzhang_txt{
    text-indent:2em;
    line-height: 30px;
}
.wenzhang div:nth-child(1){
    font-size: 26px;
    font-weight: bold;
}
.xiaoping_img{
    display: none;
}
.imgdiv{
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 20px;
}
.imgdiv>img{
    width: 49.5%;
}
@media (max-width: 1080px) { 
    .banner{
        height: 100%;
    }
    .daping_img{
        display: none;
    }
    .xiaoping_img{
        display: block;
    }
}

@media (max-width: 768px) { 
    .banner_txt div:nth-child(1){
        font-size: 25px;
    }
    .banner_txt div:nth-child(2){
        font-size: 14px;
    }
    .wenzhang div:nth-child(1){
        font-size: 20px;
        font-weight: bold;
    }
    .wenzhang{
        font-size: 14px;
    }

    .imgdiv{
        display: flex;
        flex-direction: column;
        align-items: center;
        width: 100%;
    }
    .imgdiv>img{
        width: 100%;
        margin-top: 10px;
    }
  
}