.header{
     position:relative;
}
.header-img-19{
    position:absolute;
    height: 100%;
    width: 100%;
    z-index: 6;
}
.header-img-22{
    width:150px;
    height:auto;
    position:absolute;
    z-index: 8;
    margin-left: 650px;
}
.header-img-yum {
    height: 240px;
    width: 100%;
    position: absolute;
    opacity: 0.8;
    mask-image:linear-gradient(to bottom,transparent 0%,rgb(0, 0, 0) 0%,black 50%,transparent 100%);
    z-index: 7;
}
.header-img-long{
    display:block;
    position:absolute;
    height: 250px;
    width: auto;
    left:-95px;
    top:-25px;
    z-index: 15;
    mask-image:radial-gradient(circle at center, rgba(0,0,0,0.5) calc(100% - 50px), rgba(0, 0, 0, 0) calc(100% - 70px ));
}






.bj{
    display: block;
    background-image: url(beijing.gif);
    background-size: cover;
    position:relative;
    z-index: -4;
    width: 100%;
    height: 100%;
}
.bj-img{
    width: 100%;
    height: 100%;
    background-size: cover;
    object-fit: cover;

}
.shan1{
    width:50%;
    position: absolute;
    top:60%;
    left:30%;
    height: auto;
    mix-blend-mode: multiply;
    mask-image:radial-gradient(circle at center, rgba(0,0,0,0.5) 45%, rgba(0, 0, 0, 0) calc(100% - 50px ));

}
.shan2{
    width:50%;
    position: absolute;
    top:60%;
    left:-5%;
    height: auto;
    mix-blend-mode: multiply;
    mask-image:radial-gradient(circle at center, rgba(0,0,0,0.5) 45%, rgba(0, 0, 0, 0) calc(100% - 50px ));
}
.bj-r{
    width:50%;
    position: absolute;
    top:40%;
    right:0px;
    height: auto;
    mix-blend-mode: multiply;
    mask-image:radial-gradient(circle at center, rgba(0,0,0,0.5) 45%, rgba(0, 0, 0, 0) calc(100% - 50px ));
}


.bj-c{
    position: relative;
    width: 70%;
    height: 70%;
    margin:0 auto;

}
.bj-c ul li{
    position: absolute;
    list-style: none;
    bottom:55px;
    left:25px;
}
.bj-c img{
    display:block;
    width: 1000px;
    height:auto;
}




.dibu{
    width:100%;
    height:auto;
    margin:0 auto;
    font-size: 0px;
    position:relative;
    display:flex;
    align-items: center;
}
.dibu-img{
    display:block;
    margin:0;
}

.dibu-img-7{
    z-index: 3;
}


.dibu-img-4{
    z-index: 12;
    height: 130px;
    width: auto;
    position: absolute;
    opacity: 0.6;
    mask-image:linear-gradient(to bottom,transparent 0%,rgb(0, 0, 0) 30%,black 30%,transparent 150%);
}

.dibu-img-8{
    height: 150px;
    width: auto;
    position: absolute;
    z-index: 1;
    margin-bottom:170px;
    opacity: 0.8;
}

.dibu-img-17{
    width: 100%;
    height: 0px;
    position: absolute;
    z-index: 4;
}
.dibu-img-red{
    height: 150px;
    width: 100%;
    position: absolute;
    z-index: 10;
}
.dibu-img-zi{
    width:300px;
    height:auto;
    z-index: 11;
    position:absolute;
    margin-left: 570px;
    bottom: 90px;
}
.dibu-img-2{
    width: 100px;
    height: auto;
    position: absolute;
    z-index: 5;
    right: 0px;
    bottom: 30px;
}




.logo img{
    position: absolute;
    height: auto;
    width: 365px;
    margin-left: 540px;
    margin-top: 25px;
    z-index: 9;
}