#aboutus {
  background-color: #f4f4f4;
  padding-bottom: 80px;
}
#aboutus .topline {
  overflow: hidden;
  max-width: 1680px;
  display: block;
  margin: auto;
  padding-bottom: 80px;
}
#aboutus .topline .box {
  position: relative;
  width: 31%;
  margin: 1%;
  height: 20vw;
  max-height: 320px;
  display: block;
  cursor: pointer;
}
#aboutus .topline .box1::before,
#aboutus .topline .box1::after {
  width: 100%;
  height: 100%;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  content: '';
  background: transparent url('../images/g1.png') no-repeat top scroll;
  background-size: 100%;
  transition: transform 0.5s ease;
  backface-visibility: hidden;
}
#aboutus .topline .box1::after {
  content: '';
  background: transparent url('../images/txt1.png') no-repeat top fixed;
  background-size: cover;
  transform: rotateY(180deg);
}
#aboutus .topline .box1:hover::before {
  transform: rotateY(180deg);
  box-shadow: 2px 2px 4px #ccc;
  border-radius: 24px;
}
#aboutus .topline .box1:hover::after {
  transform: rotateY(0deg);
  box-shadow: 2px 2px 4px #ccc;
  border-radius: 24px;
}
#aboutus .topline .box2::before,
#aboutus .topline .box2::after {
  width: 100%;
  height: 100%;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  content: '';
  background: transparent url('../images/g2.png') no-repeat top scroll;
  background-size: 100%;
  transition: transform 0.5s ease;
  backface-visibility: hidden;
}
#aboutus .topline .box2::after {
  content: '';
  background: transparent url('../images/txt2.png') no-repeat top fixed;
  background-size: cover;
  transform: rotateY(180deg);
}
#aboutus .topline .box2:hover::before {
  transform: rotateY(180deg);
}
#aboutus .topline .box2:hover::after {
  transform: rotateY(0deg);
}
#aboutus .topline .box3::before,
#aboutus .topline .box3::after {
  width: 100%;
  height: 100%;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  content: '';
  background: transparent url('../images/g3.png') no-repeat top scroll;
  background-size: 100%;
  transition: transform 0.5s ease;
  backface-visibility: hidden;
}
#aboutus .topline .box3::after {
  content: '';
  background: transparent url('../images/txt3.png') no-repeat top fixed;
  background-size: cover;
  transform: rotateY(180deg);
}
#aboutus .topline .box3:hover::before {
  transform: rotateY(180deg);
}
#aboutus .topline .box3:hover::after {
  transform: rotateY(0deg);
}
#aboutus .topline .box4::before,
#aboutus .topline .box4::after {
  width: 100%;
  height: 100%;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  content: '';
  background: transparent url('../images/g4.png') no-repeat top scroll;
  background-size: 100%;
  transition: transform 0.5s ease;
  backface-visibility: hidden;
}
#aboutus .topline .box4::after {
  content: '';
  background: transparent url('../images/txt4.png') no-repeat top fixed;
  background-size: cover;
  transform: rotateY(180deg);
}
#aboutus .topline .box4:hover::before {
  transform: rotateY(180deg);
}
#aboutus .topline .box4:hover::after {
  transform: rotateY(0deg);
}
#aboutus .topline .box5::before,
#aboutus .topline .box5::after {
  width: 100%;
  height: 100%;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  content: '';
  background: transparent url('../images/g5.png') no-repeat top scroll;
  background-size: 100%;
  transition: transform 0.5s ease;
  backface-visibility: hidden;
}
#aboutus .topline .box5::after {
  content: '';
  background: transparent url('../images/txt5.png') no-repeat top fixed;
  background-size: cover;
  transform: rotateY(180deg);
}
#aboutus .topline .box5:hover::before {
  transform: rotateY(180deg);
}
#aboutus .topline .box5:hover::after {
  transform: rotateY(0deg);
}
#aboutus .topline .box6::before,
#aboutus .topline .box6::after {
  width: 100%;
  height: 100%;
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  content: '';
  background: transparent url('../images/g6.png') no-repeat top scroll;
  background-size: 100%;
  transition: transform 0.5s ease;
  backface-visibility: hidden;
}
#aboutus .topline .box6::after {
  content: '';
  background: transparent url('../images/txt6.png') no-repeat top fixed;
  background-size: cover;
  transform: rotateY(180deg);
}
#aboutus .topline .box6:hover::before {
  transform: rotateY(180deg);
}
#aboutus .topline .box6:hover::after {
  transform: rotateY(0deg);
}
#aboutus .probox {
  max-width: 1680px;
  display: block;
  margin: auto;
}
#aboutus .probox .line {
  display: flex;
  flex-wrap: nowrap;
  margin-bottom: 80px;
  border-top-left-radius: 40px;
  border-bottom-right-radius: 40px;
  margin-right: 30px;
  box-sizing: border-box;
  overflow: hidden;
  box-shadow: 2px 2px 4px #ccc;
}
#aboutus .probox .line .contxt {
  flex-grow: 1;
  background-color: #fff;
  padding: 67px 0 100px 0;
}
#aboutus .probox .line .contxt .tit {
  font-family: Source Han Sans SC, Source Han Sans SC;
  font-weight: bold;
  font-size: 40px;
  color: #A73723;
  line-height: 47px;
  text-align: left;
  font-style: normal;
  text-transform: none;
  padding-bottom: 32px;
  text-align: center;
}
#aboutus .probox .line .contxt .desc {
  padding: 0 60px;
  text-align: center;
  font-family: Source Han Sans SC, Source Han Sans SC;
  font-weight: 400;
  font-size: 20px;
  color: #000000;
  line-height: 30px;
  text-align: left;
  text-transform: none;
}
#aboutus .probox .line .png {
  flex-shrink: 0;
  width: 467px;
}
#aboutus .probox .line:nth-child(1) {
  background: transparent url('../images/c1.jpg') no-repeat top fixed;
  background-size: cover;
}
#aboutus .probox .line:nth-child(1) .png {
  background: rgba(230, 111, 21, 0.3);
  border-radius: 0px 0px 0px 0px;
  display: flex;
  align-items: center;
}
#aboutus .probox .line:nth-child(1) .png img {
  display: block;
  margin: auto;
  height: 240px;
}
#aboutus .probox .line:nth-child(2) {
  background: transparent url('../images/c2.jpg') no-repeat top fixed;
  background-size: cover;
}
#aboutus .probox .line:nth-child(2) .png {
  background: rgba(18, 150, 219, 0.5);
  border-radius: 0px 0px 0px 0px;
  display: flex;
  align-items: center;
}
#aboutus .probox .line:nth-child(2) .png img {
  display: block;
  margin: auto;
  height: 240px;
}
#aboutus .probox .line:nth-child(3) {
  background: transparent url('../images/c3.jpg') no-repeat top fixed;
  background-size: cover;
}
#aboutus .probox .line:nth-child(3) .png {
  background: rgba(28, 187, 90, 0.4);
  border-radius: 0px 0px 0px 0px;
  display: flex;
  align-items: center;
}
#aboutus .probox .line:nth-child(3) .png img {
  display: block;
  margin: auto;
  height: 240px;
}
#aboutus .probox .line:nth-child(4) {
  background: transparent url('../images/c4.jpg') no-repeat top fixed;
  background-size: cover;
}
#aboutus .probox .line:nth-child(4) .png {
  background: rgba(18, 150, 219, 0.54);
  border-radius: 0px 0px 0px 0px;
  display: flex;
  align-items: center;
}
#aboutus .probox .line:nth-child(4) .png img {
  display: block;
  margin: auto;
  height: 240px;
}
#aboutus .probox .line:nth-child(5) {
  background: transparent url('../images/c5.webp') no-repeat top fixed;
  background-size: cover;
}
#aboutus .probox .line:nth-child(5) .png {
  background: rgba(228, 183, 0, 0.7);
  border-radius: 0px 0px 0px 0px;
  display: flex;
  align-items: center;
}
#aboutus .probox .line:nth-child(5) .png img {
  display: block;
  margin: auto;
  height: 240px;
}
#aboutus .probox .line:nth-child(6) {
  background: transparent url('../images/c6.jpg') no-repeat top fixed;
  background-size: cover;
}
#aboutus .probox .line:nth-child(6) .png {
  background: rgba(230, 111, 21, 0.54);
  border-radius: 0px 0px 0px 0px;
  display: flex;
  align-items: center;
}
#aboutus .probox .line:nth-child(6) .png img {
  display: block;
  margin: auto;
  height: 240px;
}