@media screen and (min-width: 1200px) {
    .content_750{
      display: none;
    }
    a {
      text-decoration: none;
      color: #333333;
    }

    div {
      box-sizing: border-box;
    }

    body {
      padding: 0;
      margin: 0;
    }

    .logo {
      display: block;
    }

    /* 导航栏 */
    .header {
      height: 100px;
      width: 100%;
      position: fixed;
      background-color: #fff;
      box-shadow: 0px 6px 14px 1px rgba(0, 0, 0, 0.16);
      z-index: 999;
    }

    .header_content {
      width: 1200px;
      margin: 0 auto;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .options {
      display: flex;
      color: #777777;
      font-size: 16px;
      height: 100%;
    }

    .option {
      width: 130px;
      display: block;
      text-align: center;
      cursor: pointer;
      height: 100%;
      line-height: 100px;
    }

    .firMenu {
      position: relative;
    }

    .secMenu {
      position: fixed;
      left: 0;
      width: 100vw;
      background-color: rgba(255, 255, 255, 0.7);
      display: none;
      box-shadow: 0px 9px 9px 1px rgba(18, 14, 116, 0.16);
    }

    .header_title {
      display: block;
      width: 130px;
      text-align: center;
      font-size: 16px;
      margin-bottom: 20px;
    }

    .header_title:hover {
      color: #3c37c0;
    }

    .firMenu:hover {
      background: #F0F4FF;
      color: #333333 !important;
    }

    .firMenu:hover .secMenu {
      display: block;
    }

    .language {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      text-align: center;
      line-height: 36px;
      color: #797979;
      border: 1px solid #cbcbcb;
      font-size: 14px;
    }

    .content {
      width: 1200px;
      margin: 200px auto 0;
    }

    .title {
      font-weight: 500;
      font-size: 40px;
      color: #333333;
      text-align: center;
    }

    .publish_time {
      margin: 48px 0;
      font-weight: 400;
      font-size: 14px;
      color: #BEBEBE;
      text-align: center;
    }

    .line {
      width: 900px;
      margin: 0 auto;
      height: 1px;
      background: #ECECEC;
      margin-bottom: 48px;
    }

    .contrainer {
      width: 900px;
      margin: 0 auto 100px;
    }

    .text {
      font-weight: 400;
      font-size: 16px;
      color: #777777;
      margin-bottom: 20px;
    }

    .banner {
      height: 550px;
    }
  }
  @media screen and (max-width: 1199px) {
    .content {
      display: none;
    }
    .content_750{
      background: #f8f8f8;
      padding: 74px 16px 60px;
    }
    .content_750_title{
      font-family: Source Han Sans CN, Source Han Sans CN;
      font-weight: 500;
      font-size: 24px;
      color: #333333;
      text-align: center;
    }
    .content_750_time{
      margin-top: 30px;
      text-align: center;
      font-weight: 400;
      font-size: 12px;
      color: #BEBEBE;
    }
    .content_750_line{
      width: 343px;
      height: 1px;
      background: #ECECEC;
      margin-top: 30px;
    }
    .contrainer_750{
      font-family: Source Han Sans CN, Source Han Sans CN;
      font-weight: 400;
      font-size: 14px;
      color: #777777;
      margin-top: 30px;
      margin-bottom: 16px;
    }
  }