<style>
  html{
      position: relative;
  }
  header{
    height: 4.5rem;
  }
  .home_top{
    width: 100%;
    height: 4.5rem;
    background: url(/img/herd-bg.png);
    position: fixed;
  }
  .xz{
    right: 1.5rem;
    top: 1.2rem;
    height: 3.3rem;
    text-decoration: none;
    font-size: 1.4rem;
    color: whitesmoke;
    position: fixed;
  }
  .home_box{
    width: 100%;
    height: 4.5rem;
    display: flex;
  }
  .logo_img {
    margin-top: 0.6rem;
    margin-left: 3.5rem;
    width: 3.3rem;
    height: 3.3rem;
    border-radius: 1.1rem;
  }
  .logo_title{
    margin-left: 1.3rem;
    margin-top: 0.7rem;
    height: 3.3rem;
    width: 14rem;
    display: flex;
    flex-direction: column;
  }
  #qx1{
    font-size: 1.5rem;
    color: #fff;
  }
  #qx2{
  font-size: 0.8rem;
  color: #666;
  }
</style>