.big_img {
  position: relative;
  width: 1903px;
  height: 8985px;
  margin: 0 auto;
  background: url('./newimg/newimg1.png') no-repeat 100% 100%;
}
.dhyy {
  width: 1255px;
  height: 1105px;
  margin: 0 auto;
  position: relative;
}
.dhyy .dhyy_box {
  position: absolute;
  width: 539px;
  height: 453px;
}
.dhyy .dhyy_box .video {
  width: 521px;
  height: 297px;
  margin: 0 auto;
  margin-top: 58px;
  cursor: pointer;
  position: relative;
}
.dhyy .dhyy_box .video_title {
  height: 58px;
  line-height: 58px;
  padding: 5px 15px;
}
.dhyy .dhyy_box .video_title p {
  width: 364px;
  padding-left: 15px;
  font-size: 18px;
  font-family: MicrosoftYaHei;
  font-weight: 400;
  color: #ffffff;
  line-height: 49px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  float: left;
}
.dhyy .dhyy_box .video_title span {
  float: right;
  height: 58px;
  font-size: 18px;
  font-family: MicrosoftYaHei;
  font-weight: 400;
  color: #ffffff;
  line-height: 49px;
  padding-left: 15px;
  width: 80px;
}
.dhyy .dhyy_box1 {
  left: 65px;
  top: 104px;
}
.dhyy .dhyy_box2 {
  right: 75px;
  top: 104px;
}
.dhyy .dhyy_box3 {
  left: 65px;
  bottom: 52px;
}
.dhyy .dhyy_box4 {
  right: 75px;
  bottom: 52px;
}
.dhal {
  width: 1102px;
  height: 493px;
  padding-top: 17px;
  margin: 0 auto;
  position: relative;
}
.dhal .dhal_left {
  width: 546px;
  height: 469px;
  float: left;
  margin-right: 28px;
  position: relative;
  cursor: pointer;
}
.dhal .dhal_left .title_box {
  width: 100%;
  height: 35px;
  line-height: 35px;
  position: absolute;
  left: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.2);
  color: #fff;
  font-size: 12px;
}
.dhal .dhal_left .title_box .lf {
  width: 80%;
  float: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.dhal .dhal_left .title_box .lf span {
  padding-left: 20px;
}
.dhal .dhal_left .title_box .rg {
  width: 20%;
  float: right;
  text-align: right;
}
.dhal .dhal_left .title_box .rg span {
  padding-right: 20px;
}
.dhal .dhal_right {
  float: left;
}
.dhal .dhal_right .dhal_right_video {
  width: 442px;
  height: 218px;
  margin-bottom: 33px;
  position: relative;
  cursor: pointer;
}
.dhal .dhal_right .dhal_right_video .title_box {
  width: 100%;
  height: 35px;
  line-height: 35px;
  position: absolute;
  left: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.2);
  color: #fff;
  font-size: 12px;
}
.dhal .dhal_right .dhal_right_video .title_box .lf {
  width: 80%;
  float: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.dhal .dhal_right .dhal_right_video .title_box .lf span {
  padding-left: 20px;
}
.dhal .dhal_right .dhal_right_video .title_box .rg {
  width: 20%;
  float: right;
  text-align: right;
}
.dhal .dhal_right .dhal_right_video .title_box .rg span {
  padding-right: 20px;
}
.dhal_diagram {
  width: 1085px;
  height: 513px;
  margin: 0 auto;
  position: relative;
}
.dhal_diagram .dhal_diagram_box {
  width: 491px;
  height: 241px;
  float: left;
  margin-right: 17px;
  margin-bottom: 16px;
  cursor: pointer;
  position: relative;
}
.dhal_diagram .dhal_diagram_box .title_box {
  width: 100%;
  height: 35px;
  line-height: 35px;
  position: absolute;
  left: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.2);
  color: #fff;
  font-size: 12px;
}
.dhal_diagram .dhal_diagram_box .title_box .lf {
  width: 80%;
  float: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.dhal_diagram .dhal_diagram_box .title_box .lf span {
  padding-left: 20px;
}
.dhal_diagram .dhal_diagram_box .title_box .rg {
  width: 20%;
  float: right;
  text-align: right;
}
.dhal_diagram .dhal_diagram_box .title_box .rg span {
  padding-right: 20px;
}
.dh_style {
  width: 1052px;
  margin: 0 auto;
  position: relative;
}
.dh_style .style_top {
  padding-left: 85px;
  height: 555px;
}
.dh_style .style_top .top_box {
  width: 372px;
  height: 397px;
  float: left;
  margin-right: 107px;
  cursor: pointer;
  position: relative;
}
.dh_style .style_mid {
  height: 553px;
  margin: 0 auto;
  width: 1052px;
}
.dh_style .style_mid .mid_box {
  width: 851px;
  height: 396px;
  margin-left: 85px;
  position: relative;
}
.dh_style .style_bot {
  margin: 0 auto;
  width: 1052px;
  height: 1000px;
}
.dh_style .style_bot .bot_box {
  width: 372px;
  height: 196px;
  float: left;
  position: relative;
  margin: 0 24px 157px 85px;
}
.dh_style .style_bot .bot_box4 {
  margin-left: 87px;
}
.scrolltop {
  width: 479px;
  height: 113px;
  margin: 0 auto;
  transform: translateX(-10px);
  cursor: pointer;
}