.desy-about4 {
  padding: 50px 0;
  background: #F8F8F8;
}

.desy-about4 ul li {
  display: -webkit-flex;
  display: flex;
}

.desy-about4 ul li+li {
  margin-top: 50px;
}
.desy-about4 ul li:nth-child(2n+1) .pic {
   width: 47.5%;
   position: relative;
   display: block;
   overflow: hidden;
   float: left;
   margin: 0 0px 20px 0px;
}
.desy-about4 ul li .pic {
  width: 44.5%;
  position: relative;
  display: block;
  overflow: hidden;
  float: right;
  margin: 0 0 20px 60px;
}

.desy-about4 ul li .pic img {
  display: block;
  width: 100%;
  transition: all 0.3s ease 0s;
  -webkit-transition: all 0.3s ease 0s;
}
::-webkit-scrollbar {
  width: 5px; /* 垂直滚动条宽度 */
  
}
/* 滚动条轨道 */
::-webkit-scrollbar-track {
  background: #b9b9b9;
  border-radius: 10px;
}

/* 滚动条滑块 */
::-webkit-scrollbar-thumb {
  background: #01009099;
  border-radius: 10px;
}

/* 滚动条滑块悬停状态 */
::-webkit-scrollbar-thumb:hover {
  background: #555;
}
.desy-about4 ul li .txt {
  -webkit-flex: 1;
  flex: 1;
  margin: 0 0px 0 30px;
  overflow: hidden;
  /* box-sizing: border-box; */
  border-bottom: 1px solid #D6D6D6;
  /* display: -webkit-flex; */
  /* display: flex; */
  /* -webkit-justify-content: center; */
  /* justify-content: center; */
  /* -webkit-flex-direction: column; */
  /* flex-direction: column; */
  max-height: 501px;
  overflow-y: scroll;
  padding-right: 10px;
  text-align: justify;
}

.desy-about4 ul li .txt h5 {
  font-size: 36px;
  color: #000;
  font-weight: 400;
}

.desy-about4 ul li .txt p {
  font-size: 17px;
  color: #333;
  line-height: 2;
  margin: 5px 0 0;
}

.desy-about4 ul li:nth-child(2n+1) {
  -webkit-flex-direction: row-reverse;
  flex-direction: row-reverse;
}

.desy-about4 ul li:nth-child(2n+1) .txt {
  padding: 0 66px 0 0;
}

.desy-about4 ul li .pic:hover img {
  transform: scale(1.05);
  -webkit-transform: scale(1.05);
}

@media screen and (max-width:1400px) {
  .desy-about4 {
    padding: 90px 0;
  }

  .desy-about4 ul li .txt p {
    font-size: 17px;
    line-height: 1.6;
    margin: 20px 0 0;
  }
}

@media screen and (max-width:991px) {
  .desy-about4 {
    padding: 30px 0;
  }

  .desy-about4 ul li {
    -webkit-flex-direction: column;
    flex-direction: column;
  }

  .desy-about4 ul li+li {
    margin-top: 20px;
  }

  .desy-about4 ul li .pic {
    width: 100%;
    text-align: center;
    margin: 0;
  }

  .desy-about4 ul li .txt {
    margin: 20px 0 0;
    border-bottom: none;
  }

  .desy-about4 ul li .txt h5 {
    font-size: 22px;
    text-align: center;
  }

  .desy-about4 ul li .txt p {
    font-size: 16px;
    line-height: 1.4;
    margin: 15px 0 0;
  }

  .desy-about4 ul li:nth-child(2n+1) {
    -webkit-flex-direction: column;
    flex-direction: column;
  }

  .desy-about4 ul li:nth-child(2n+1) .txt {
    margin: 20px 0 0;
    padding: 0 10px 0 0;
  }
  .desy-about4 ul li:nth-child(2n+1) .pic {
    width: 100%;
  }
}