.banner {
  height: 498px;
  background: url("../img/yunchanpin.jpg") no-repeat bottom;
  background-size: cover;
}
.content {
  margin: 20px 0;
}
.content .title {
  text-align: center;
  font-size: 42px;
  font-weight: bold;
  margin: 0;
}