#introduction .container {
  margin-top: 54px;
}
#introduction .container .title {
  position: relative;
  font-size: 48px;
  font-weight: 500;
  color: #212329;
  line-height: 67px;
  text-align: center;
  margin-bottom: 80px;
}

#introduction .container .title:after {
  position: absolute;
  left: 46%;
  bottom: -8px;
  content: "";
  width: 80px;
  height: 4px;
  background: #14ae67;
}

#introduction .container .icons {
  display: flex;
  justify-content: space-around;
}
#introduction .icon-item {
  display: flex;
  flex-direction: column;
  align-items: center;
}
#introduction .icon-item img {
  width: 72px;
}
#introduction .icon-item .count {
  font-size: 32px;
  font-weight: 500;
  color: #212329;
  line-height: 45px;
  padding-top: 10px;
}
#introduction .icon-item .covered {
  font-size: 16px;
  font-weight: 400;
  color: rgba(33, 35, 41, 0.65);
  line-height: 22px;
}
#introduction .infos {
  margin-top: 80px;
}
#introduction .infos .info {
  margin-bottom: 40px;
  font-size: 20px;
  font-weight: 400;
  color: rgba(0, 0, 0, 0.65);
  line-height: 36px;
}

/*--------------------
2.devlopment-course
----------------------*/
#devlopmentCourse .container {
}

#devlopmentCourse .container .title {
  position: relative;
  font-size: 48px;
  font-weight: 500;
  color: #212329;
  line-height: 67px;
  text-align: center;
  margin-bottom: 80px;
  font-family: PingFangSC-Medium, PingFang SC;
}

#devlopmentCourse .container .title:after {
  position: absolute;
  left: 46%;
  bottom: -8px;
  content: "";
  width: 80px;
  height: 4px;
  background: #14ae67;
}

#devlopmentCourse .years {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: space-around;
}

#devlopmentCourse .year-item {
  margin-bottom: 40px;
}

#devlopmentCourse .year-item .num {
  font-size: 48px;
  font-weight: 500;
  color: #212329;
  line-height: 67px;
}
#devlopmentCourse .year-item .info {
  width: 580px;
  height: 192px;
  background: #DCF5EA;
  border-radius: 4px;
  opacity: 0.45;
  padding: 24px;
}

/*--------------------
3.certificate
----------------------*/
#certificate .items {
  display: flex;
  margin: 0 auto;
  justify-content: space-around;
  margin-bottom: 40px;
}

#certificate .container .title {
  position: relative;
  font-size: 48px;
  font-weight: 500;
  color: #212329;
  line-height: 67px;
  text-align: center;
  margin-bottom: 40px;
  font-family: PingFangSC-Medium, PingFang SC;
}

#certificate .container .title:after {
  position: absolute;
  left: 46%;
  bottom: -8px;
  content: "";
  width: 80px;
  height: 4px;
  background: #14ae67;
}

#certificate .items .item {
  width: 214px;
}
#certificate .items .item + .item{
  margin-left: 28px;
}

#certificate .items .item img {
  width: 100%;
}