.st-tab {
  display: flex;
  gap: 20px;
}
.st-tab a {
  display: block;
  flex: 1;
}
.st-tab .item {
  background-repeat: no-repeat;
  background-size: 100% auto;
  height: 230px;
  flex: 1;
  justify-content: space-between;
}
.st-tab .item.item-1 {
  background-image: url("./../images/method-tab-1.png");
}
.st-tab .item.item-2 {
  background-image: url("./../images/method-tab-2.png");
}
.st-tab .item.item-3 {
  background-image: url("./../images/method-tab-3.png");
}
.st-tab .item.item-4 {
  background-image: url("./../images/method-tab-4.png");
}
.st-tab .item.active.item-1 {
  background-image: url("./../images/method-tab-1s.png");
}
.st-tab .item.active.item-2 {
  background-image: url("./../images/method-tab-2s.png");
}
.st-tab .item.active.item-3 {
  background-image: url("./../images/method-tab-3s.png");
}
.st-tab .item.active.item-4 {
  background-image: url("./../images/method-tab-4s.png");
}

.conn {
  padding-bottom: 200px;
  font-size: 20px;
  line-height: 30px;
}
.conn h3 {
  font-size: 28px;
  line-height: 45px;
  padding: 0px 0 0 0;
}
.conn h4 {
  font-size: 20px;
  line-height: 34px;
  padding-bottom: 15px;
}
.conn p {
  font-size: 14px;
  line-height: 20px;
  color: #999;
}
.conn h5 {
  font-size: 20px;
  line-height: 28px;
  padding-bottom: 10px;
}
.conn .pb10 {
  padding-bottom: 10px;
}
.conn .pb30 {
  padding-bottom: 30px;
}
.conn img {
  width: 100%;
}

.list-m2 {
  padding-top: 100px;
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  -moz-column-gap: 200px;
       column-gap: 200px;
}
.list-m2 .item {
  flex: 1 1 calc(50% - 100px);
  padding-bottom: 35px;
}
.list-m2 img {
  max-width: 100px;
}

hr {
  height: 1px;
  background-color: #979797;
}

.conn-4 p {
  font-size: 18px;
  line-height: 38px;
}

.bg1 {
  background-color: #f6d14e;
  text-align: center;
}

.bg2 {
  background-color: #efefef;
  text-align: center;
}

.b-t {
  font-size: 90px;
  padding-bottom: 30px;
  text-align: center;
}

@media screen and (max-width: 750px) {
  .recommend {
    padding: 150px 0 100px 50px;
  }
  .recommend .text {
    font-size: 60px;
  }
  .st-tab {
    padding: 0 50px;
  }
  .st-tab .item {
    height: 150px;
  }
  .conn {
    padding: 0 50px 50px 50px;
  }
  .conn p {
    font-size: 22px;
    line-height: 36px;
  }
  .list-m2 {
    -moz-column-gap: 50px;
         column-gap: 50px;
  }
}