.us_text_pc {
  position: relative;
}
.us_text_pc .bg {
  width: 100%;
  object-fit: cover;
  position: absolute; background-attachment:fixed;
  z-index: -1;
  top: 0;
  left: 0;
}
.us_text_pc .text {
  width: 70%;
  margin: 0 auto;
  padding-top: 100px;
  text-align: center;
}
.us_text_pc .text h2 {
  text-align: center;
  font-family: "SimSun";
  font-size: 40px;
  margin-bottom: 200px;
  padding-left: 100px;
}
.us_text_pc .text p {
  line-height: 2;
  text-indent: 2em;
  font-size: 22px;
  text-align: justify;
  padding-left: 100px;
}
.us_text_m {
  position: relative; overflow:hidden;
  display: none;
}
.us_text_m .bg {
  width: 100%;
  position: absolute;
  z-index: -1;
  top: 30px;
  left: 20px;
  height: 100%;
  object-fit: cover;
}
.us_text_m .text {
  width: 90%;
  margin: 0 auto;
  margin-top: 50px;
}
.us_text_m .text p {
  line-height: 2;
  font-size: 16px;
  text-align: justify;
  margin-bottom: 10px;
}
.us_tit_m {
  display: none;
  text-align: center;
}
@media screen and (max-width: 768px) {
  .us_text_pc {
    display: none;
  }
  .us_text_m {
    display: block;
  }
  .us_tit_m {
    display: block;
  }
}