.banner {
  width: 100%;
  height: 538px;
  margin-top: 85px;
  background: url('https://school-resource-file.oss-cn-beijing.aliyuncs.com/web/img/products/banner.jpg') no-repeat center;
}

.container {
  width: 1348px;
  height: auto;
  margin: 0 auto;
  margin-top: 70px;
  margin-bottom: 70px;
}

.container div {
  margin-top: 50px;
}