#about_1 {
  background: url(../img/history-bgc.jpg) no-repeat;
  background-size: cover;
  background-position: bottom;
  overflow: hidden;
}
#about_1 .r_center {
  width: 100%;
  padding: 0 1.6rem;
  margin: 2rem 0 1rem 0;
}
#about_1 .r_center .history-box {
  width: 100%;
  height: 2rem;
  position: relative;
}
#about_1 .r_center ul {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0;
  top: 0;
  float: none;
  z-index: 10;
  cursor: move;
}
#about_1 .r_center ul li {
  width: 0.13rem;
  height: 0.13rem;
  position: absolute;
  float: none;
  list-style: none;
}
#about_1 .r_center ul li i {
  width: 0.13rem;
  height: 0.13rem;
  position: relative;
  background: #ccc;
  float: left;
  cursor: pointer;
  border-radius: 50%;
  transition: all 0.3s ease-in-out;
  z-index: 1;
}
#about_1 .r_center ul li span {
  position: absolute;
  float: none;
  left: 16%;
  transform: translateX(-16%);
  width: fit-content;
  bottom: 0.5rem;
}
#about_1 .r_center ul li span h3 {
  font-size: 24px;
  color: #333;
  width: 50%;
  font-weight: 400;
  margin: 0;
  transition: all 0.35s ease-in-out;
}
#about_1 .r_center ul li span h4 {
  overflow: hidden;
  font-size: 0.16rem;
  color: #666;
  font-weight: 400;
  margin: 0;
  width: 3rem;
  margin-top: 0.18rem;
  text-align: left;
}
#about_1 .r_center ul li.b span {
  bottom: auto;
  top: 0.3rem;
}
#about_1 .r_center ul li.active span h3 {
  font-weight: 700;
  font-size: 28px;
  color: #e60012;
}
#about_1 .r_center .car {
  width: 61px;
  height: 38px;
  position: absolute;
  float: none;
  opacity: 0;
  margin: -10px 0 0 -20px;
  z-index: 10;
}
#about_1 .r_center .redcar {
  width: 61px;
  height: 38px;
  position: absolute;
  float: none;
  opacity: 0;
  margin: -7px 0 0 -20px;
  z-index: 10;
}
#about_1 .r_center canvas {
  position: absolute;
  left: 0;
  top: 0;
  pointer-events: none;
}
#about_1 .r_center #history-list {
  display: none;
}
#about_1 img {
  float: none;
  margin: 0 5px;
  border: none;
}
#about_1 img:nth-child(1) {
  margin-top: -10px;
}
@media screen and (max-width: 1200px) {
  #about_1 .r_center {
    margin: 0;
    padding: 0 20px;
  }
  #about_1 .r_center .history-box {
    height: auto;
  }
  #about_1 .r_center ul {
    height: auto;
    width: 100%;
    position: relative;
    float: left;
    top: auto;
    left: auto;
    cursor: default;
  }
  #about_1 .history ul {
    margin-bottom: 30px;
    max-height: 60vh;
    overflow: hidden;
    overflow-y: scroll;
  }
  #about_1 .history ul li {
    width: 100%;
    height: auto;
    position: relative;
    float: left;
    margin-top: 20px;
  }
  #about_1 .history ul li i {
    display: none;
  }
  #about_1 .history ul li span {
    width: 100%;
    position: relative;
    float: left;
    left: auto;
    bottom: auto;
    transform: translateX(0);
    white-space: normal;
  }
  #about_1 .history ul li span h4 {
    line-height: 22px;
    overflow: hidden;
    font-size: 14px;
    text-align: left;
    margin: 10px 0;
    width: 100%;
  }
}