.course {
  font-family: Microsoft YaHei-Bold, Microsoft YaHei;
}
.course .about_t img {
  width: 20%;
}
.course .about_t_list {
  display: flex;
}
.course .about_t_list li {
  margin-bottom: 30%;
  position: relative;
}
.course .about_t_list li h2 {
  font-weight: bold;
  margin: 20px 0;
}
.course .about_t_list li p {
  font-size: 13px;
}
.course .about_t_list .picBox {
  position: relative;
  display: inline-block;
}
.course .about_t_list .about_year {
  position: absolute;
  bottom: -8%;
  display: flex;
  justify-content: center;
  align-items: center;
  width: 16%;
}
.course .about_t_list .about_year img {
  position: absolute;
}
.course .about_t_list .about_year span {
  z-index: 5;
  color: #fff;
}
.course .about_t_list .drop {
  width: 4.4%;
  position: absolute;
  top: 28%;
}
.course .about_t_list .list-left {
  width: 50%;
  border-right: 1px dashed #BEBEBE;
  padding-top: 8%;
  position: relative;
}
.course .about_t_list .list-left .about_year {
  right: -2%;
}
.course .about_t_list .list-left .drop {
  right: -2.2%;
}
.course .about_t_list .list-left li {
  padding-right: 8%;
}
.course .about_t_list .list-left li:last-child {
  margin-bottom: 20px;
}
.course .about_t_list .list-right {
  width: calc(50% - 1px);
  padding-top: 30%;
}
.course .about_t_list .list-right li {
  padding-left: 8%;
  text-align: right;
}
.course .about_t_list .list-right .about_year {
  left: -2%;
}
.course .about_t_list .list-right .drop {
  left: -2.2%;
}
.course .endimg {
  width: 100%;
  display: flex;
  justify-content: center;
  position: relative;
  top: -33px;
  left: 1%;
}
.course .desc {
  padding-bottom: 6%;
}
.course .desc p {
  font-size: 16px;
  margin-top: 3%;
  text-indent: 2em;
}
.main {
  position: relative;
}
.main .mainbg {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  z-index: -1;
}