.content {
  margin-bottom: 64px;
}

.banner {
  width: 100%;
  height: 450px;
}

.banner img {
  width: 100%;
  height: 100%;
}

.dangqian {
  height: 40px;
  width: 1200px;
  margin: auto;
  background-color: #f7f7f7;
  line-height: 40px;
  margin-top: 20px;
  margin-bottom: -10px;
}

.main-box {
  margin: 0 auto;
  width: 1200px;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  margin-top: 30px;
  flex-wrap: wrap;
}

.mian-box-item {
  width: 290px;
  height: 160px;
  border-top: 5px solid #1c649f;
  background-color: #f7f7f7;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  margin-bottom: 20px;
  color: #333;
}

.mian-box-item-title {
  font-size: 18px;
  font-family: Microsoft YaHei;
  margin-top: 30px;
}

.mian-box-item:hover {
  background-color: #1c649f;
  color: #fff;
}

@media screen and (max-width: 768px) {
  .banner {
    height: auto;
  }
  .banner img {
    height: auto;
  }
  .dangqian {
    width: 100%;
  }
  .main-box {
    width: 100%;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
  }
  .main-box a {
    width: 50%;
  }
  .mian-box-item {
    width: 100%;
  }
}