.activity_box {
    width: 100%;
    min-width: 1200px;
}
.activity_img1 {
    height: 1126px;
    background: url("../img/subject/nanshan/nanshan_img_1.jpg");
    background-size: auto 1126px;
}
.activity_img2 {
    height: 1434px;
    background: url("../img/subject/nanshan/nanshan_img_2.jpg");
    background-size: auto 1434px;
}
.activity_img3 {
    height: 1251px;
    background: url("../img/subject/nanshan/nanshan_img_3.jpg");
    background-size: auto 1251px;
}
.activity_img4 {
    height: 1699px;
    background: url("../img/subject/nanshan/nanshan_img_4.jpg");
    background-size: auto 1699px;
}
.activity_img1,
.activity_img2,
.activity_img3,
.activity_img4 {
    width: 100%;
    background-position: center;
    position: relative;
}
.activity_img2 a,
.activity_img3 a {
    position: absolute;
    right: 50%;
    transform: translateX(50%);
    width: 358px;
    height: 112px;
}
.activity_img2 a {
    bottom: 94px;
}
.activity_img3 a {
    top: 240px;
}
.activity_img4 a {
    position: absolute;
    width: 151px;
    height: 40px;
    right: 50%;
    transform: translateX(214px);
}
.activity_img4 a:nth-of-type(1) {
    top: 658px;
}
.activity_img4 a:nth-of-type(2) {
    bottom: 389px;
}