@media screen and (min-width: 1280px) {
  .product_mian_bao_xie {
    height: 80px;
    background: #1B1B1B;
    padding: 0 15%;
    top: 69px;
    color: white;
    font-size: x-large;
    display: flex;
    align-items: center;
    position: fixed;
    width: 100%;
    left: 0;
    z-index: 9;
  }

  #product_item_top_html {
    margin-top: 179px;
  }

  .product_mian_bao_xie .product_title {
    flex: 1;
  }

  .product_mian_bao_xie .product_menu {
    width: 130px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .product_mian_bao_xie .product_menu>a {
    color: white;
    font-size: large;
    transition: all .5s;
    -moz-transition: all .5s;
    -webkit-transition: all .5s;
    -o-transition: all .5s;
  }

  .product_mian_bao_xie .product_menu>a.product_zixun {
    color: #EE7700;
  }

  .product_mian_bao_xie .product_menu>a:hover {
    color: #EE7700;
  }

  .product_mian_bao_xie .product_menu>a.product_zixun:hover {
    color: tomato;

  }

  .product_video_body {
    position: relative;
  }

  .product_video_body video {
    width: 100%;
    display: block;
  }

  .product_video_body .play {
    position: absolute;
    left: 50%;
    top: 50%;
  }

  #product_item_gui_ge_can_shu,
  #product_item_zi_liao_xia_zai,#contact_us_title {
    font-size: 36px;
    font-weight: bold;
    color: #000000;
    line-height: 104px;
    text-align: center;
    padding-top: 100px;
    padding-bottom: 50px;
  }

  .product_item_gui_ge_can_shu_block {
    line-height: 100px;
    background: #F2F2F2;
    font-weight: bold;
    font-size: x-large;
    text-align: center;
  }

  .product_item_gui_ge_can_shu_list_body {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 30px 0;
  }

  .product_item_gui_ge_can_shu_list {
    width: 1200px;
    display: inline-block;
    padding: 20px 0;
  }

  .product_item_gui_ge_can_shu_list>div {
    display: inline-block;
    width: 24%;
    margin-bottom: 20px;
    vertical-align: text-top;
    padding-right: 10px;
  }

  .product_item_gui_ge_can_shu_name {
    font-size: 16px;
    font-weight: bold;
  }

  .product_item_gui_ge_can_shu_val {

    font-size: 20px;

  }

  .product_item_pei_jian_image {
    display: flex;
    justify-content: center;
    align-items: center;
/*    height: 300px;*/
    cursor: pointer;
    overflow: hidden;
  }

  .product_item_pei_jian_image img {
    width: 100%;
    transition: all .5s;
    -moz-transition: all .5s;
    -webkit-transition: all .5s;
    -o-transition: all .5s;
    transform: scale(1);
    -webkit-transform: scale(1);
  }

  .product_item_pei_jian_image:hover img {
    transform: scale(1.2);
    -webkit-transform: scale(1.2);

  }

  .product_item_pei_jian_name {
    font-size: 20px;
    text-align: center;
  }

  .product_item_xia_zai_list_body {
    text-align: center;
/*    padding-bottom: 120px;*/
  }

  .product_item_xia_zai_list {
    max-width: 1200px;
    display: inline-block;
  }

  .product_item_xia_zai_item {
    width: 340px;
    padding: 25px;
    background: #FFFFFF;
    border: 1px solid rgba(0, 0, 0, 0.5);
    border-radius: 20px;
    text-align: center;
    display: inline-block;
    margin: 10px 20px;
  }

  .product_item_xia_zai_item_name {
    font-size: 22px;
    font-weight: 400;
    color: #000000;
    height: 62px;
    display: flex;
    align-items: center;
    justify-content:center;
  }

  .product_item_xia_zai_item_file_size {
    font-size: 12px;
    font-weight: 400;
    color: #000000;
    margin: 15px 0;
  }

  .product_item_xia_zai_item_btn>a {

    width: 124px;
    height: 38px;
    background: #000;
    color: white !important;
    display: inline-block;
    border-radius: 19px;
    line-height: 38px;
    cursor: pointer;

  }

  .product_item_xia_zai_item_btn {
    text-align: center;
  }

  .product_item_gui_ge_can_shu_list_box {
    transform: translate(-50%, -50%);
    -webkit-transform: translate(-50%, -50%);

  }

}