.topnav{width: 100%;height:.9rem;background-color: rgb(0, 162, 255);color: #fff;text-align: center;
  line-height: 0.9rem;font-size: .28rem;letter-spacing: 5px;font-weight: 500;position: fixed;left: 0;top:0;}
.top_pic{
  width: 0.15rem;
  height: 0.27rem;
  position: absolute;
  top: 0.315rem;
  left: 0.6rem;
}
.space{
  width: 100%;
  height: 0.9rem;
}

.banner{
  width: 100%;
  overflow: hidden;
}

.infos{
  background-color: #fff;
  padding: 10px 15px;
  border-bottom: solid 1px #eee;
}

.infos h2{
  font-size: 18px;margin-bottom: 10px;
}
.content{
  padding: 15px;
  background-color: #fff;
  margin-top: 15px;
  font-size: .28rem;
  line-height: .4rem;
}
.content img{
  width: 100%;
}
@media all  and (min-width:1025px){
  .topnav{
    width:7.5rem;
    left: 50%;margin-left:-3.75rem;
  }
  .space,.main{
    width: 7.5rem;margin:0 auto;
  }
}