.topBanner {
  position: relative;
}

.topBanner .txt {
  width: 100%;
  height: 100%;
  position: absolute;
  color: white;
  top: 0;
  left: 0;
}

.topBanner .txt .w {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  height: 100%;
}

.topBanner .txt h2 {
  font-size: 36px;
}

.topBanner .txt p {
  font-size: 22px;
  margin: 3% 0 5%;
}

.topBanner .txt a {
  display: inline-block;
  width: 122px;
  height: 40px;
  line-height: 40px;
  text-align: center;
  font-size: 16px;
  background: transparent;
  border: 1px solid white;
}

@media (max-width: 1200px) {
  .topBanner .txt h2 {
    font-size: 29px;
  }
  .topBanner .txt p {
    font-size: 20px;
  }
  .topBanner .txt a {
    width: 97px;
    height: 32px;
    line-height: 32px;
    font-size: 14px;
  }
}

@media (max-width: 996px) {
  .topBanner .txt h2 {
    font-size: 25px;
  }
  .topBanner .txt p {
    font-size: 18px;
  }
}

@media (max-width: 768px) {
  .topBanner .txt .w {
    text-align: center;
  }
  .topBanner .txt p {
    margin: 2% 0;
  }
  .topBanner .txt a {
    margin: 0 auto;
  }
}

@media (max-width: 480px) {
  .topBanner .txt h2 {
    font-size: 20px;
    margin-bottom: 3%;
  }
  .topBanner .txt p {
    display: none;
  }
  .topBanner .txt a {
    width: 77px;
    height: 26px;
    line-height: 26px;
    font-size: 13px;
  }
}

.topBanner1 {
    width: 100%;
    height: 560px;
    position: relative;
}

@media (max-width: 1200px) {
    .topBanner1 {
        height: 450px;
    }
}

@media (max-width: 996px) {
    .topBanner1 {
        height: 385px;
    }
}

@media (max-width: 768px) {
    .topBanner1 {
        height: 308px;
    }
}

@media (max-width: 480px) {
    .topBanner1 {
        height: 265px;
    }
}

.des {
  text-align: center;
  padding: 7% 0 8%;
}

.des h3 {
  font-size: 36px;
  color: #282828;
  font-weight: 600;
  margin-bottom: 2%;
}

.des span {
  display: inline-block;
  width: 68%;
  font-size: 14px;
  color: #666;
  line-height: 30px;
  text-align: center;
}

@media (max-width: 992px) {
  .des h3 {
    font-size: 29px;
  }
  .des span {
    width: 85%;
  }
}

@media (max-width: 768px) {
  .des h3 {
    font-size: 23px;
  }
}

@media (max-width: 480px) {
  .des h3 {
    font-size: 18px;
  }
  .des span {
    width: 95%;
    font-size: 13px;
    line-height: 25px;
  }
}

.list li {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
}

.list .img {
  width: 39%;
}

.list .txt {
  width: 61%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
}

.list .txt h3 {
  font-size: 36px;
  color: #282828;
  margin-bottom: 3%;
}

.list .txt span {
  font-size: 14px;
  color: #666;

  line-height: 30px;
}

.list .item_1 {
  background: #f0f0f0;
}

.list .item_1 .txt {
  padding-left: 5%;
}

.list .item_1 .txt span {
  width: 65%;
}

.list .item_2 {
  background: white;
}

.list .item_2 .txt {
  padding-left: 20%;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
}

.list .item_2 .txt span {
  width: 95%;
}

@media (max-width: 1200px) {
  .list .txt h3 {
    font-size: 31px;
  }
  .list .item_1 .txt span {
    width: 95%;
  }
}

@media (max-width: 992px) {
  .list li {
    width: 95%;
    margin: 0 auto;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-direction: column;
            flex-direction: column;
  }
  .list li .img {
    width: 100%;
  }
  .list .txt {
    text-align: center;
    width: 95%;
    margin: 0 auto;
  }
  .list .txt h3 {
    font-size: 31px;
    margin-top: 3%;
  }
  .list .item_1 .txt span {
    width: 100%;
  }
  .list .item_1 .txt, .list .item_2 .txt {
    padding-left: 0;
  }
}

@media (max-width: 768px) {
  .list .txt h3 {
    font-size: 23px;
  }
  .list .txt span {
    font-size: 13px;
    line-height: 27px;
  }
}

@media (max-width: 480px) {
  .list .txt h3 {
    font-size: 18px;
  }
  .list{
      margin-bottom:10%;
  }
}