.ysxy {
  overflow: hidden;
  padding: 4rem;
}
.ysxy h1 {
  margin-bottom: 6rem;
  font-size: 4rem;
  text-align: center;
}
.ysxy h2 {
  margin-bottom: 2rem;
  font-size: 3.2rem;
}
.ysxy p {
  margin-bottom: 2rem;
  font-size: 2.8rem;
  line-height: 4rem;
  text-indent: 6rem;
}
.ysxy ul {
  padding-left: 6rem;
}
.ysxy ul li {
  margin-bottom: 1rem;
  font-size: 2.8rem;
}
.ysxy img {
  width: 100%;
}
.history{
  padding: 4rem 2rem;
  text-indent: 2rem;
}
.history li {
  font-size: 2.4rem;
  line-height: 4rem;
}