.box {
  overflow: hidden;
  box-sizing: border-box;
  background: #fff;
  padding:0rem 0 18rem;
}
.banner {
  width: 100%;
  height: 10.8rem;
  background: url(../images/banner.png) no-repeat top center;
  background-size: auto 100%;
  margin-bottom: 0.8rem;
  position: relative;
  box-sizing: border-box;
  padding-top: .2rem;
}
.banner_txt{
  margin: 0 auto 0;
  width: 85%;
}
.code{
  color: #ffff;
  text-align: center;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
}
.min_title{
  font-size: 1rem;
  text-align: center;
  line-height: 1.3rem;
  color: #4436d3;
  margin: .5rem auto;
}
.code img{
  width: 45%;
}
.code .fenbu{
  width: 50%;
  text-align: center;
  margin: 0 auto .5rem;
}
.code .fenbu img{
  width: 70%;
  margin: 0 auto;
}
  .nav{
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    margin: .4rem auto .2rem;
  }
  .nav span{
    display: block;
    font-size: .65rem;
    width: 2.3rem;
    line-height: 1rem;
    border: solid 1px #4436d3;
    margin: 0 .1rem .3rem;
    border-radius: 1rem;
    cursor: pointer;
    text-align: center;
    box-sizing: border-box;
    color: #565655;
  }
  .nav .on{
    background: linear-gradient(0deg,#ff592e,#fecf3b);
    color: #fff;
    -webkit-animation-name: pulse;
    animation-name: pulse;
  }
  .nav01 .on{
    animation:tada .8s linear infinite;
  }
  .nav_big{
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
  }
  .nav_big span{
    width: 4rem;
    line-height: 1.2rem;
    margin: 0 .2rem;
    border-radius: 1rem;
    text-align: center;
    border: .05rem #4436d3 solid;
    color: #4436d3;
    cursor: pointer;
  }
  .nav_big .on{
    background: linear-gradient(90deg, #4436d3, #4436d3);
    color: #fff;
    -webkit-animation-name: pulse;
    animation-name: pulse;
    animation:tada .8s linear infinite;
  }
  
/* 图片底部的样色描述*/
.code .cell{
  width: 45%;
  margin: 0 1%;
  text-align: center;
}
.code .cell img{
  width: 100%;
  display: block;
}
.code .caption{
  color: #000;
  line-height: 1.5;
  font-size: 0.8rem;
  margin-top: .15rem;
  font-weight: bold;
}