.wrap_con {
  width: 1200px;
  margin: 0 auto;
}
.wrap_con .classification {
  margin-top: 40px;
}
.wrap_con .classification .classification_left {
  width: 82px;
  font-size: 16px;
  font-family: PingFangSC-Medium, PingFang SC;
  font-weight: 500;
  color: #E96A00;
  line-height: 30px;
  float: left;
}
.wrap_con .classification .classification_right {
  float: left;
  width: 1088px;
}
.wrap_con .classification .classification_right .classification_big .whole-box {
  float: left;
  padding: 0 16px;
  margin-bottom: 20px;
  font-size: 15px;
  font-family: PingFangSC-Regular, PingFang SC;
  font-weight: 400;
  color: #999999;
  line-height: 30px;
  letter-spacing: 1px;
}
.wrap_con .classification .classification_right .classification_big .whole_active {
  height: 20px;
  background: #E96A00;
  border-radius: 4px;
  line-height: 20px;
  padding: 0 16px;
  color: #fff;
  position: relative;
  top: 5px;
}
.wrap_con .classification .classification_right .classification_big .whole_active:hover {
  color: #fff !important;
}
.wrap_con .classification .classification_right .classification_big .whole_active:after {
  position: absolute;
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 7px 3.5px 0 3.5px;
  border-color: #E96A00  transparent transparent transparent;
  margin-top: 20px;
  margin-left: -37%;
}
.wrap_con .classification .classification_right .classification_big ul li {
  float: left;
  padding: 0 16px;
  margin-bottom: 20px;
}
.wrap_con .classification .classification_right .classification_big ul li a {
  font-size: 15px;
  font-family: PingFangSC-Regular, PingFang SC;
  font-weight: 400;
  color: #999999;
  line-height: 30px;
  letter-spacing: 1px;
}
.wrap_con .classification .classification_right .classification_big ul .active a {
  height: 30px;
  background: #E96A00;
  border-radius: 4px;
  padding: 0 16px;
  line-height: 30px;
  color: #fff;
  position: relative;
}
.wrap_con .classification .classification_right .classification_big ul .active a:hover {
  color: #fff !important;
}
.wrap_con .classification .classification_right .classification_big ul .active a:after {
  position: absolute;
  content: '';
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 7px 3.5px 0 3.5px;
  border-color: #E96A00  transparent transparent transparent;
  margin-top: 25px;
  margin-left: -37%;
}
.wrap_con .classification .classification_right .classification_samll ul {
  display: none;
}
.wrap_con .classification .classification_right .classification_samll ul li {
  float: left;
  padding: 0 16px;
  margin-bottom: 20px;
}
.wrap_con .classification .classification_right .classification_samll ul li a {
  font-size: 15px;
  font-family: PingFangSC-Regular, PingFang SC;
  font-weight: 400;
  color: #999999;
  line-height: 30px;
  letter-spacing: 1px;
}
.wrap_con .classification .classification_right .classification_samll ul .samll_active a {
  color: #E96A00;
}
.xian {
  width: 1200px;
  height: 1px;
  border-bottom: 1px solid #DFDFDF;
  clear: both;
}
.course_list {
  width: 1200px;
}
.course_list .sub:nth-child(4n) {
  margin-right: 0px !important;
}
.course_list .sub {
  width: 286px;
  height: 260px;
  background: #FFFFFF;
  float: left;
  margin-top: 30px;
  margin-right: 18px;
}
.course_list .sub .sub_top {
  width: 286px;
  height: 157px;
}
.course_list .sub .sub_top img {
  width: 286px;
  height: 157px;
}
.course_list .sub .sub_titile {
  padding: 16px;
}
.course_list .sub .sub_titile .sub_titile_1 {
  width: 267px;
  height: 22px;
  font-size: 16px;
  font-family: PingFangSC-Regular, PingFang SC;
  font-weight: 400;
  color: #333333;
  line-height: 22px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}
.course_list .sub .sub_titile .sub_titile_2 {
  width: 267px;
  height: 20px;
  font-size: 14px;
  font-family: PingFangSC-Regular, PingFang SC;
  font-weight: 400;
  color: #666666;
  line-height: 20px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
  margin-top: 18px;
}
.dhyin {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  display: block;
}