@media screen and (min-width: 1024px) {
  .body-all-box {
    width: 1200px;
    margin: 0 auto;
  }
  .banner-img {
    width: 100%;
    height: 200px;
    background-image: url(../img/about-us-img1.jpg);
    background-position: center center;
    min-width: 1200px;
    margin-bottom: 60px;
  }
  .class-nav {
    width: 880px;
    margin: 0 auto;
    height: 60px;
    margin-bottom: 75px;
  }
  .class-nav a {
    display: block;
    width: 20%;
    float: left;
    font-size: 14px;
    height: 60px;
    background-color: #333;
    color: #C8A05A;
    line-height: 60px;
    text-align: center;
  }
  .class-nav a.act {
    background-color: #C8A05A;
    color: #fff;
  }
  .body-tit {
    width: 880px;
    margin: 0 auto;
    margin-bottom: 10px;
    font-size: 32px;
    color: #000;
    text-align: center;
    line-height: 90px;
    line-height: 88px;
    font-family: MingLiU;
    border-top: 1px solid #333;
    border-bottom: 1px solid #333;
  }
  .body-img-box {
    margin-bottom: 40px;
  }
  .body-img-box .pc-img {
    display: block;
    margin: 0 auto;
  }
  .body-img-box .mobi-img {
    display: none;
  }
}
@media screen and (max-width: 1023px) {
  .body-all-box {
    width: 95%;
    margin: 0 auto;
  }
  .banner-img {
    width: 100%;
    height: 2rem;
    background-image: url(../img/about-us-img1.jpg);
    background-size: auto 100%;
    background-position: center center;
    margin-bottom: .5rem;
  }
  .class-nav {
    width: 100%;
    margin: 0 auto;
    height: .8rem;
    margin-bottom: .5rem;
  }
  .class-nav a {
    display: block;
    width: 20%;
    float: left;
    font-size: .24rem;
    height: .8rem;
    background-color: #333;
    color: #C8A05A;
    line-height: .8rem;
    text-align: center;
  }
  .class-nav a.act {
    background-color: #C8A05A;
    color: #fff;
  }
  .body-tit {
    margin: 0 auto;
    margin-bottom: .5rem;
    font-size: .4rem;
    color: #000;
    text-align: center;
    line-height: 1rem;
    font-family: MingLiU;
    border-top: 1px solid #333;
    border-bottom: 1px solid #333;
  }
  .body-img-box {
    margin-bottom: .5rem;
  }
  .body-img-box .pc-img {
    display: none;
  }
  .body-img-box .mobi-img {
    width: 100%;
  }
}