.about-us .flex {  display: flex;
  align-items: center;
}
.about-us .introduce {
  margin: 30px auto;
  padding: 50px 30px;
  width: 900px;
  background: #fff;
  box-shadow: 0px 1px 10px rgba(0, 0, 0, 0.1);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.about-us .introduce .item {
  flex: 1;
  display: flex;
  align-items: center;
  flex-direction: column;
}
.about-us .introduce .item:not(:last-of-type) {
  border-right: 1px solid #e7e7e7;
}
.about-us .introduce .item img {
  height: 60px;
  margin-bottom: 20px;
}
.about-us .introduce .item p {
  margin: 0;
}
.about-us .introduce .item .item-title {
  text-align: center;
  width: 120px;
  font-size: 18px;
}
.about-us .bottom-introduce {
  display: flex;
  align-items: center;
  width: 1200px;
  margin: 0 auto;
  justify-content: space-between;
  color: #333;
  text-align: center;
}
.about-us .bottom-introduce .item {
  width: 300px;
}
.about-us .bottom-introduce .item-title {
  margin: 30px 0;
    color: #333;
  font-size: 20px;
}
.about-us .bottom-introduce .item-desc {
  font-size: 16px;
  line-height: 1.8;
}
.x_icon_center {
  margin-bottom: 20px;
  width: 60px; 
  height: 60px; 
  font-size: 60px; 
  font-weight: bold; 
  color: #555;
  text-align: center;
}