.about_banner {
  height: 540px;
  background-size: cover;
  overflow: hidden;
}
.about_banner .about_us {
  width: 500px;
  color: #fff;
  margin: 156px 0 0 54%;
}
.about_banner .about_us header {
  font-size: 40px;
  font-weight: bold;
  margin-bottom: 40px;
}
.about_banner .about_us article {
  font-size: 18px;
  line-height: 32px;
}
.about .about_list {
  width: 1120px;
  margin: 120px auto;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: justify;
  -ms-flex-pack: justify;
  justify-content: space-between;
  -ms-flex-wrap: wrap;
  flex-wrap: wrap;
  border-bottom: 1px solid #E6E6E6;
  position: relative;
}
.about .about_list .a_item {
  width: 500px;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  margin-bottom: 110px;
}
.about .about_list .a_item .left {
  padding: 0 40px 0 0;
}
.about .about_list .a_item .left img {
  width: 160px;
  height: 160px;
  border-radius: 50%;
}
.about .about_list .a_item .right .title {
  font-size: 18px;
  color: #555555;
  padding: 20px 0;
  font-weight: bold;
  width: 108px;
  border-bottom: 2px solid #1ADDA0;
}
.about .about_list .a_item .right article {
  margin-top: 20px;
  font-size: 14px;
  color: #555;
  line-height: 26px;
}
.about .about_list .circle {
  width: 8px;
  height: 8px;
  background: #e6e6e6;
  border-radius: 50%;
  position: absolute;
  bottom: -50px;
  left: 50%;
  margin-left: -50px;
  border: 46px solid #fff;
}
.about .slogan {
  text-align: center;
  font-size: 18px;
  color: #666;
  line-height: 36px;
  margin-bottom: 120px;
}