.banner {
  width: 100%;
}

.banner img {
  width: 100%;
}

.box{
  margin-top: 140px;
  background: url("../img/orientation-bg.png") center top no-repeat;
  background-size: 100%;
}
.domain>img {
  margin: 60px auto 40px;
}

.domain-box ul {
  overflow: hidden;
}
.domain-box ul li {
  float: left;
  margin-right: 5px;
}
.domain-box ul li:last-child {
  margin-right: 0;
}
.domain-box ul li img {
  width: 150px;
  height: 387px;
}
.domain-img-m {
  display:none;
}
@media screen and (max-width: 640px){
  .box {
    margin-top: 0.2rem;
  }
  .domain>img {
    margin: 0.2rem auto;
    width: 100%;
  }
  .domain-box ul {
    display: none;
  }
  .domain-img-m {
    display:block;
    width: 100%;
  }
}
