.xiangqingye{
    width: 1120px;
    margin: 0 auto;
    padding: 20px 40px;
    min-height: 320px;
}
.xiangqingye .big-title{
    font-size: 22px;
    line-height: 1.5;
    color: #000000;
    text-align: center;
    font-weight: bolder;
}
.xiangqingye-cont{
    margin-top: 100px;
}
.xiangqingye-cont p{
    font-size: 20px;
    text-indent: 2em;
    line-height: 2;
    font-weight: normal;
    text-align: justify;
}
.goback{
    display: flex;
    justify-content: center;
    margin-top: 40px;
}
.but_back{
    background-color: #FFFFFF;
    background-image: url(../images/back3.png);
    border: 0px;
    width: 105px;
    height: 43px;
    cursor: pointer;
}
@media screen and (max-width: 750px) {

    /* 头部 */
    .yy-header {
      width: 100%;
      position: fixed;
      top: 0;
      left: 0;
    }
    .yy-header .yyh-logo img {
      width: 75%;
      height: auto;
      margin-left: 15px;
    }

    .yy-navbox {
      width: 100%;
      position: fixed;
      left: 0;
    }

    .yy-nav-ul li {
      width: 25%;
    }

    .yy-nav-li a {
      font-size: 14px;
      color: #fff;
    }
    .xiangqingye{
        min-height: 0px;
       width: 85%;
       margin: 0 auto;
       padding: 0;
       padding-top: 25px;
    }
    .xiangqingye-cont p {
        font-size: 17px;
        text-indent: 2em;
        line-height: 36px;
        font-weight: normal;
        text-align: justify;
    }
 .xiangqingye .big-title{
        font-size: 20px;
    }
    .yyf-bot {
      display: none;
    }
    .xiangqingye-cont {
    margin-top: 100px;
}

  }
@media screen and (max-width: 668px) {

    /* 头部 */
    .yy-header {
      width: 100%;
      position: fixed;
      top: 0;
      left: 0;
    }
    .yy-header .yyh-logo img {
      width: 75%;
      height: auto;
      margin-left: 15px;
    }

    .yy-navbox {
      width: 100%;
      position: fixed;
      left: 0;
    }

    .yy-nav-ul li {
      width: 25%;
    }

    .yy-nav-li a {
      font-size: 14px;
      color: #fff;
    }
    .xiangqingye{
       min-height: 0px;
       width: 85%;
       margin: 0 auto;
       padding: 0;
       padding-top: 25px;
    }
    .xiangqingye-cont p {
        font-size: 17px;
        text-indent: 2em;
        line-height: 36px;
        font-weight: normal;
        text-align: justify;
    }
 .xiangqingye .big-title{
        font-size: 20px;
    }
    .yyf-bot {
      display: none;
    }


  }