.cn_download_content{
    width: 1200px;
    margin: 0 auto;
    margin-bottom: 150px;
    position: relative;
    padding-top: 200px;
}
.cn_download_content_left{
    width: 30px;
    height: 30px;
    position: absolute;
    top: 430px;
    left: -50px;
    cursor: pointer;
}
.cn_download_content_left img{
    width: 30px;
    height: 30px;
}
.cn_download_content_right{
    width: 30px;
    height: 30px;
    position: absolute;
    top: 430px;
    right: -50px;
    cursor: pointer;
}
.cn_download_content_right img{
     width: 30px;
     height: 30px;
 }
.cn_download_list_box{
    width: 1200px;
    height: 486px;
    overflow: hidden;
    position: relative;
}
.cn_download_list{
    width: 200%;
    position: absolute;
    top: 0;
    left: 0;
}
.cn_download_item{
    width: 50%;
}
.cn_download_item img{
    width: 100%;
    height: 486px;
}